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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

OR

For the quarterly period ended June 30, 2008 Commission File Number: 1-6622

WASHINGTON REAL ESTATE INVESTMENT TRUST

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code (301) 984-9400

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding twelve (12) months (or such shorter period that the Registrant was required to file such report) and (2) has been subject to such filing requirements for the past ninety (90) days.    YES  x    NO  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large accelerated filer,” “accelerated filer” or “smaller reporting company” in Rule 12b-2 of the Exchange Act). (Check One):

Large Accelerated Filer  x    Accelerated Filer  ¨    Non-Accelerated Filer  ¨    Smaller Reporting Company  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    YES  ¨    NO  x

Number of shares outstanding of common stock, as of August 7, 2008: 49,467,772

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WASHINGTON REAL ESTATE INVESTMENT TRUST

INDEX

Part I

FINANCIAL INFORMATION

The information furnished in the accompanying unaudited Consolidated Balance Sheets, Statements of Income, Statements of Cash Flows and Statement of Changes in Shareholders’ Equity reflects all adjustments, consisting of normal recurring items, which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods. The accompanying financial statements and notes thereto should be read in conjunction with the financial statements and notes for the three years ended December 31, 2007 included in the Trust’s 2007 Annual Report on Form 10-K filed with the Securities and Exchange Commission.

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ITEM I. FINANCIAL STATEMENTS

WASHINGTON REAL ESTATE INVESTMENT TRUST

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share amounts)

See accompanying notes to the financial statements.

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(UNAUDITED)

See accompanying notes to the financial statements.

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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS’ EQUITY

(In thousands)

(UNAUDITED)

See accompanying notes to the financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(UNAUDITED)

See accompanying notes to the financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

NOTE 1: NATURE OF BUSINESS

Washington Real Estate Investment Trust (“WRIT,” the “Company” or the “Trust”), a Maryland Real Estate Investment Trust, is a self-administered, self-managed equity real estate investment trust, successor to a trust organized in 1960. Our business consists of the ownership and development of income-producing real estate properties in the greater Washington metro region. We own a diversified portfolio of office buildings, medical office buildings, industrial/flex centers, multifamily properties and retail centers.

Federal Income Taxes

We believe that we qualify as a Real Estate Investment Trust (REIT) under Sections 856-860 of the Internal Revenue Code and intend to continue to qualify as such. To maintain our status as a REIT, we are required to distribute at least 90% of our ordinary taxable income to our shareholders. When selling properties, we have the option of (i) reinvesting the sale price of properties sold, allowing for a deferral of income taxes on the sale, (ii) paying out capital gains to the shareholders with no tax to the company or (iii) treating the capital gains as having been distributed to the shareholders, paying the tax on the gain deemed distributed and allocating the tax paid as a credit to the shareholders. In June 2008, two industrial properties, Sullyfield Center and The Earhart Building, were sold for a gain of $15.3 million. The proceeds from the sale are expected to be reinvested in a replacement property.

NOTE 2: ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading. In addition, in the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These unaudited financial statements should be read in conjunction with the financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2007.

Within these notes to the financial statements, we refer to the three and six months ended June 30, 2008 as the “2008 Quarter” and the “2008 Period”, respectively, and the three and six months ended June 30, 2007 as the “2007 Quarter” and the “2007 Period”, respectively.

New Accounting Pronouncements

In September 2006, the FASB issued FASB Statement No. 157, “Fair Value Measurements” (SFAS No. 157). SFAS No. 157 defines fair value, establishes a framework for measuring fair value in accordance with generally accepted accounting principles (GAAP), and expands disclosures about fair value measurements. On February 12, 2007, the FASB issued FASB Staff Position No. FAS 157-2, Effective Date of FASB Statement No. 157 (“the FSP”). The FSP amends SFAS No. 157 to delay the effective date for all non-financial assets and non-financial liabilities, except for those that are recognized or disclosed at fair value in the financial statements on a recurring basis (i.e. at least annually). The FSP defers the effective date of SFAS No. 157 to fiscal years beginning after November 15, 2008, and interim periods within those fiscal years for items within the scope of the proposed FSP. The effective date of the statement related to those items not covered by the deferral (all financial assets and liabilities or non-financial assets and liabilities recorded at fair value on a recurring basis) is for fiscal years beginning after November 15, 2007. We do not have significant assets or liabilities recorded at fair value on a recurring basis, and therefore the adoption of this statement on January 1, 2008 did not have a material impact on our financial statements. However, this statement requires us to provide expanded disclosures of our valuation techniques.

In February 2007, the FASB issued SFAS No. 159, “The Fair Value Option for Financial Assets and Financial Liabilities – Including an Amendment of FASB Statement No. 115.” SFAS No. 159 permits entities to choose to measure eligible items at fair value at specified election dates and report unrealized gains and losses on items for which the fair value option has been elected in earnings at each subsequent reporting date. SFAS No. 159 is effective for fiscal years beginning after November 15, 2007. We have not elected the fair value option for any assets or liabilities, and therefore the adoption of the statement did not have a material impact on our financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

In December 2007, the FASB issued SFAS No. 141(R), “Business Combinations,” a revision of SFAS No. 141. This statement changes the accounting for acquisitions by specifically eliminating the step acquisition model, changing the recognition of contingent consideration from being recognized when it is probable to being recognized at the time of acquisition, disallowing the capitalization of transaction costs, and delaying when restructuring related to acquisitions can be recognized. The standard is effective for fiscal years beginning after December 15, 2008, and will only impact the accounting for acquisitions we make after our adoption. Accordingly, upon our adoption of this standard on January 1, 2009, there will not be any impact on our historical financial statements.

Also in December 2007, the FASB issued SFAS No. 160, “Noncontrolling Interests in Consolidated Financial Statements,” which clarifies the classification of noncontrolling interests in consolidated statements of financial position and the accounting for and reporting of transactions between the reporting entity and holders of such noncontrolling interests. Under the new standard noncontrolling interests are considered equity and should be reported as an element of consolidated equity. Net income will encompass the total income of all consolidated subsidiaries and there will be a separate disclosure on the face of the income statement of the attribution of that income between the controlling and noncontrolling interests. Increases and decreases in the noncontrolling ownership interest amount will be accounted for as equity transactions. The standard is effective for fiscal years beginning after December 15, 2008. The statement will require us to change the presentation only of minority interest on our financial statements.

In March 2008 the FASB issued SFAS No. 161, “Disclosures about Derivative Instruments and Hedging Activities, an Amendment of FASB Statement No. 133” (FAS 161). This statement requires entities to provide greater transparency about how and why an entity uses derivative instruments, and how derivative instruments and related hedged items affect an entity’s financial position, results of operations, and cash flows. To meet these objectives, FAS 161 requires (1) qualitative disclosures about objectives for using derivatives by primary underlying risk exposure and by purpose or strategy, (2) information about the volume of derivative activity, (3) tabular disclosures about balance sheet location and gross fair value amounts of derivative instruments, income statement and other comprehensive income location and amounts of gains and losses on derivative instruments by type of contract, and (4) disclosures about credit risk-related contingent features in derivative agreements. FAS 161 is effective for financial statements issued for fiscal years beginning after November 15, 2008. This statement will require us to provide expanded disclosures only of our interest rate hedge contract.

On May 9, 2008, the FASB issued FASB Staff Position APB 14-a (“the FSP”). This guidance clarifies the accounting for convertible debt instruments that may be settled in cash (including partial cash settlement) upon conversion. This guidance will significantly impact the accounting of the Company’s convertible debt by requiring bifurcation of a component of the debt, classification of that component in stockholders’ equity, and then accretion of the resulting discount on the debt to result in interest expense equal to the issuer’s nonconvertible debt borrowing rate. The calculation of earnings-per-share will not be affected, other than the impact on net income from the debt discount amortization. The FSP will be effective for fiscal years beginning after December 15, 2008. We believe that the adoption of the proposed FSP will have a significant impact on our financial statements due to our convertible debt outstanding and are in the process of quantifying the impact.

Revenue Recognition

Residential properties (our multifamily segment) are leased under operating leases with terms of generally one year or less, and commercial properties (our office, medical office, retail and industrial segments) are leased under operating leases with average terms of three to seven years. We recognize rental income and rental abatements from our residential and commercial leases when earned on a straight-line basis in accordance with SFAS No. 13 “Accounting for Leases.” Recognition of rental income commences when control of the facility has been given to the tenant. We record a provision for losses on accounts receivable equal to the estimated uncollectible amounts. This estimate is based on our historical experience and a review of the current status of the Company’s receivables. Percentage rents, which represent additional rents based on gross tenant sales, are recognized when tenants’ sales exceed specified thresholds.

In accordance with SFAS No. 66, “Accounting for Sales of Real Estate,” sales are recognized at closing only when sufficient down payments have been obtained, possession and other attributes of ownership have been transferred to the buyer and we have no significant continuing involvement.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

We recognize cost reimbursement income from pass-through expenses on an accrual basis over the periods in which the expenses were incurred. Pass-through expenses are comprised of real estate taxes, operating expenses and common area maintenance costs which are reimbursed by tenants in accordance with specific allowable costs per tenant lease agreements.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable primarily represents amounts accrued and unpaid from tenants in accordance with the terms of the respective leases, subject to our revenue recognition policy. Receivables are reviewed monthly and reserves are established when, in the opinion of management, collection of the receivable is doubtful. When the collection of a receivable is deemed doubtful in the same quarter that the receivable was established, then the allowance for that receivable is recognized as an offset to real estate revenues. When a receivable that was initially established in a prior quarter is deemed doubtful, then the allowance is recognized as an operating expense. In addition to rents due currently, accounts receivable include amounts representing minimal rental income accrued on a straight-line basis to be paid by tenants over the remaining term of their respective leases. Reserves are established for tenants whose rent payment history or financial condition casts doubt upon the tenant’s ability to perform under its lease obligation.

Minority Interest

We entered into an operating agreement with a member of the entity that previously owned Northern Virginia Industrial Park in conjunction with the acquisition of this property in May 1998. This resulted in a minority ownership interest in this property based upon defined company ownership units at the date of purchase. The operating agreement was amended and restated in 2002 resulting in a reduced minority ownership percentage interest. We account for this activity by recording minority interest expense by applying the minority owner’s percentage ownership interest to the net income of the property and including such amount in our general and administrative expenses, thereby reducing net income.

In August 2007 we acquired a 0.8 acre parcel of land located at 4661 Kenmore Avenue, Alexandria, Virginia for future medical office development. The acquisition was funded by issuing operating units in a consolidated subsidiary of WRIT. This resulted in a minority ownership interest in this property based upon defined company ownership units at the date of purchase. We account for this activity by recording minority interest expense by applying the minority owner’s percentage ownership interest to the net income of the property and including such amount in our general and administrative expenses, thereby reducing net income.

Minority interest expense was $52,800 and $110,200 for the 2008 Quarter and 2008 Period, respectively, and $52,900 and $105,200 for the 2007 Quarter and 2007 Period, respectively. Quarterly distributions are made to the minority owners equal to the quarterly dividend per share for each ownership unit.

Deferred Financing Costs

External costs associated with the issuance or assumption of mortgages, notes payable and fees associated with the lines of credit are capitalized and amortized using the effective interest rate method or the straight-line method which approximates the effective interest rate method over the term of the related debt. As of June 30, 2008 and December 31, 2007, deferred financing costs of $21.4 million and $23.9 million, respectively, net of accumulated amortization of $5.0 million and $7.9 million, were included in Prepaid Expenses and Other Assets on the balance sheets. The amortization is included in Interest Expense in the accompanying statements of income. The amortization of debt costs included in Interest Expense totaled $0.6 million and $1.3 million for the 2008 Quarter and 2008 Period, respectively, and $0.6 million and $1.1 million for the 2007 Quarter and the 2007 Period, respectively.

Deferred Leasing Costs

Costs associated with the successful negotiation of leases, both external commissions and internal direct costs, are capitalized and amortized on a straight-line basis over the terms of the respective leases. If an applicable lease terminates prior to the expiration of its initial lease term, the carrying amount of the costs are written-off to amortization expense. As of June 30, 2008 and December 31, 2007 deferred leasing costs of $26.1 million and $23.8 million, respectively, net of accumulated amortization of $9.3 million and $8.3 million, were included in Prepaid Expenses and Other Assets on the balance sheets. The amortization of deferred leasing costs included in Amortization Expense for properties classified as continuing operations totaled $0.8 million and $1.7 million for the 2008 Quarter and the 2008 Period, respectively, and $0.7 million and $1.5 million for the 2007 Quarter and the 2007 Period, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

Real Estate and Depreciation

Buildings are depreciated on a straight-line basis over estimated useful lives ranging from 28 to 50 years. All capital improvement expenditures associated with replacements, improvements, or major repairs to real property that extend its useful life are capitalized and depreciated using the straight-line method over their estimated useful lives ranging from 3 to 30 years. We also capitalize costs incurred in connection with our development projects, including capitalizing interest and other internal costs during periods in which development projects are in progress. In addition, we capitalize tenant leasehold improvements when certain criteria are met, including when we supervise construction and will own the improvements. All tenant improvements are amortized over the shorter of the useful life of the improvements or the term of the related tenant lease. Real estate depreciation expense from continuing operations was $17.2 million and $34.0 million for the 2008 Quarter and Period, respectively, and $13.6 million and $26.1 million for the 2007 Quarter and Period, respectively. Maintenance and repair costs that do not extend an asset’s life are charged to expense as incurred.

We capitalize interest costs incurred on borrowing obligations while qualifying assets are being readied for their intended use in accordance with SFAS No. 34, “Capitalization of Interest Cost.” Total interest expense capitalized to real estate assets related to development and major renovation activities was $0.7 million and $1.4 million for the 2008 Quarter and Period, respectively, and $1.6 million and $2.9 million for the 2007 Quarter and Period, respectively. Interest capitalized is amortized over the useful life of the related underlying assets upon those assets being placed into service.

We recognize impairment losses on long-lived assets used in operations and held for sale, development assets or land held for future development, if indicators of impairment are present and the net undiscounted cash flows estimated to be generated by those assets are less than the assets’ carrying amount and estimated undiscounted cash flows associated with future development expenditures. If such carrying amount is in excess of the estimated cash flows from the operation and disposal of the property, we would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to the estimated fair value. There were no property impairments recognized during 2008 and 2007 Quarters and 2008 and 2007 Periods.

We allocate the purchase price of acquired properties to the related physical assets and in-place leases based on their fair values, in accordance with SFAS No. 141, “Business Combinations.” The fair values of acquired buildings are determined on an “as-if-vacant” basis considering a variety of factors, including the physical condition and quality of the buildings, estimated rental and absorption rates, estimated future cash flows and valuation assumptions consistent with current market conditions. The “as-if-vacant” fair value is allocated to land, building and tenant improvements based on property tax assessments and other relevant information obtained in connection with the acquisition of the property. No goodwill was recorded on our acquisitions for the 2008 and 2007 Quarters and 2008 and 2007 Periods.

The fair value of in-place leases consists of the following components – (1) the estimated cost to us to replace the leases, including foregone rents during the period of finding a new tenant and foregone recovery of tenant pass-throughs (referred to as “Absorption Cost”), (2) the estimated cost of tenant improvements, and other direct costs associated with obtaining a new tenant (referred to as “Tenant Origination Cost”); (3) estimated leasing commissions associated with obtaining a new tenant (referred to as “Leasing Commissions”); (4) the above/below market cash flow of the leases, determined by comparing the projected cash flows of the leases in place to projected cash flows of comparable market-rate leases (referred to as “Net Lease Intangible”); and (5) the value, if any, of customer relationships, determined based on our evaluation of the specific characteristics of each tenant’s lease and our overall relationship with the tenant (referred to as “Customer Relationship Value”).

The amounts used to calculate Net Lease Intangible are discounted using an interest rate which reflects the risks associated with the leases acquired. Tenant Origination Costs are included in Real Estate Assets on our balance sheet and are amortized as depreciation expense on a straight-line basis over the remaining life of the underlying leases. Leasing Commissions and Absorption Costs are classified as Other Assets and are amortized as amortization expense on a straight-line basis over the remaining life of the underlying leases. Net Lease Intangible Assets are classified as Other Assets and are amortized on a straight-line basis as a decrease to Real Estate Rental Revenue over the remaining term of the underlying leases. Net Lease Intangible Liabilities are classified as Other Liabilities and are amortized on a straight-line basis as an increase to Real Estate Rental Revenue over the remaining term of the underlying leases. Should a tenant terminate its lease, the unamortized portion of the Tenant Origination Cost, Leasing Commissions, Absorption Costs and Net Lease Intangible associated with that lease are written off to depreciation expense, amortization expense, and rental revenue, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

Balances, net of accumulated depreciation or amortization, as appropriate, of the components of the fair value of in-place leases at June 30, 2008 and December 31, 2007 are as follows (in millions):

Amortization of these components combined was $2.5 million and $4.7 million for the 2008 Quarter and Period, respectively, and $2.0 million and $4.2 million for the 2007 Quarter and Period, respectively. In addition, we have a below-market ground lease intangible asset from a 2007 acquisition with a gross carrying value of $12.1 million as of June 30, 2008. No value had been assigned to Customer Relationship Value at June 30, 2008 or December 31, 2007.

Discontinued Operations

We classify properties as held for sale when they meet the necessary criteria specified by SFAS No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets” and EITF 03-13, “Applying the Conditions in Paragraph 42 of FASB Statement No. 144, Accounting for the Impairment or Disposal of Long-Lived Assets, in Determining Whether to Report Discontinued Operations.” These include: senior management commits to and actively embarks upon a plan to sell the assets, the sale is expected to be completed within one year under terms usual and customary for such sales and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. Depreciation on these properties is discontinued, but operating revenues, operating expenses and interest expense continue to be recognized until the date of sale.

Under SFAS No. 144, revenues and expenses of properties that are either sold or classified as held for sale are presented as discontinued operations for all periods presented in the Statements of Income. Interest on debt that can be identified as specifically attributed to these properties is included in discontinued operations. We do not have significant continuing involvement in the operations of any of our disposed properties.

Cash and Cash Equivalents

Cash and cash equivalents include investments readily convertible to known amounts of cash with original maturities of 90 days or less.

Restricted Cash

Restricted cash at June 30, 2008 and December 31, 2007 consisted of $48.9 million and $6.0 million, respectively, in funds escrowed for tenant security deposits for certain tenants, real estate tax, insurance and mortgage escrows and escrow deposits required by lenders on certain of our properties to be used for future building renovations or tenant improvements. The balance at June 30, 2008 includes proceeds from the sale of real estate of $40.2 million escrowed in a tax free property exchange account (see Note 3).

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

Assets and Liabilities Measured at Fair Value

For assets and liabilities measured at fair value on a recurring basis, SFAS No. 157, Fair Value Measurements, requires quantitative disclosures about the fair value measurements separately for each major category of assets and liabilities. The only assets or liabilities the Company has at June 30, 2008 that are recorded at fair value on a recurring basis are the assets held in the Supplemental Executive Retirement Program (“SERP”) and an interest rate hedge contract. The Company’s valuations related to these items are based on assumptions derived from significant other observable inputs and accordingly fall into Level 2 in the fair value hierarchy. The fair value of these assets and liabilities at June 30, 2008 is as follows (in millions):

Derivative Instruments

In February 2008, we entered into an interest rate swap with a notional amount of $100 million that qualifies as a cash flow hedge under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities (see Note 6 for further details). We enter into interest rate swaps to manage our exposure to variable rate interest risk. We do not purchase derivatives for speculation. Our cash flow hedges are recorded at fair value. The effective portion of changes in fair value of cash flow hedges is recorded in other comprehensive income. The ineffective portion of changes in fair value of cash flow hedges is recorded in earnings in the period affected. We assess effectiveness of our cash flow hedges both at inception and on an ongoing basis. The hedge was deemed effective in the 2008 Quarter and Period. We did not have any cash flow hedges during 2007.

Stock Based Compensation

We maintained a Share Grant Plan and Incentive Stock Option Plans as described in Note 7, and pursuant to those plans we made restricted share grants and granted share options to officers, eligible employees and trustees. Officer share grants vesting over five years vest in annual installments commencing one year after the date of grant, and share grants vesting over three years vest twenty-five percent from date of grant in years one and two and fifty percent in year three. Officer performance share units, granted under an amendment to the Share Grant Plan, cliff vest at the end of a three year performance period. Officer and non-officer employee restricted share units, granted under an amendment to the Share Grant Plan, vest over five years. Trustee share grants are fully vested immediately upon date of share grant and are restricted from transferability for the period of the trustee’s service.

In March 2007, the WRIT Board of Trustees adopted, and in July 2007 WRIT shareholders approved, the Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan (“2007 Plan”). This plan replaced the Share Grant Plan, which expired on December 15, 2007, as well as the 2001 Stock Option Plan and Stock Option Plan for Trustees. As described above, the shares and options granted pursuant to the above plans are not affected by the adoption of the 2007 Plan. However, if an award under the Share Grant Plan is forfeited or an award of options granted under the Option Plans expires without being exercised, the shares covered by those awards will not be available for issuance under the 2007 Plan.

The 2007 Plan provides for the award to WRIT’s trustees, officers and non-officer employees of restricted shares, restricted share units, options and other awards to acquire up to an aggregate of 2,000,000 shares over the ten year period in which the plan will be in effect. If an award under the 2007 Plan of restricted shares or restricted share units is forfeited or an award of options or any other rights granted under the 2007 Plan expires without being exercised, the shares covered by any such award would again become available for issuance under new awards.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

Compensation expense is recognized for share grants over the vesting period equal to the fair market value of the shares on the date of issuance. Compensation expense for the trustee grants, which fully vest immediately, is fully recognized upon issuance based upon the fair market value of the shares on the date of grant. The unvested portion of officer and non-officer employee share grants is recognized in compensation cost over the vesting period.

Unvested shares are forfeited upon an employee’s termination except for employees eligible for retirement whose unvested shares fully vest upon retirement. For shares granted to employees who are eligible for retirement or will become eligible for retirement during the vesting period, compensation cost is recognized over the explicit service period with acceleration of expense upon the date of actual retirement for these employees. The Company will continue this practice for awards granted prior to January 1, 2006, when SFAS No. 123R was adopted, and for shares granted after the adoption of SFAS No. 123R the Company will recognize compensation expense through the date that the employee is no longer required to provide service to earn the award (e.g. the date the employee is eligible to retire).

Stock options were historically issued annually to officers, non-officer key employees and trustees under the Incentive Stock Option Plans. They were last issued to officers in 2002, to non-officer key employees in 2003 and to trustees in 2004. The options vested over a 2-year period in annual installments commencing one year after the date of grant, except for trustee options which vested immediately upon the date of grant. Stock options issued prior to the adoption of SFAS No. 123R are accounted for in accordance with APB No. 25, whereby if options are priced at fair market value or above at the date of grant and if other requirements are met then the plans are considered fixed and no compensation expense is recognized. Accordingly, we have recognized no compensation cost for stock options.

Earnings per Common Share

We calculate basic and diluted earnings per share in accordance with SFAS No. 128, “Earnings per Share.” “Basic earnings per share” excludes dilution and is computed by dividing net income by the weighted-average number of common shares outstanding for the period. “Diluted earnings per share” reflects the potential dilution that could occur if securities or other contracts to issue common shares were exercised or converted into common shares, and then shared in our earnings. Sources of potentially dilutive common shares are our share based payment plans, operating partnership units and senior convertible notes. The senior convertible notes were not dilutive for the three and six months ended June 30, 2008 or June 30, 2007.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

The following table sets forth the computation of basic and diluted earnings per share (dollars in thousands; except per share data):

Use of Estimates in the Financial Statements

The preparation of financial statements in conformity with U. S. generally accepted accounting principles requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.

Other Comprehensive Income (Loss)

We recorded other comprehensive income of $0.4 million for the period ended June 30, 2008 to account for the change in valuation of an interest rate swap agreement that qualifies as a cash flow hedge under SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities. We recorded no other comprehensive income or loss for 2007.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

NOTE 3: REAL ESTATE INVESTMENTS

Our real estate investment portfolio, at cost, consists of properties located in Maryland, Washington, D.C. and Virginia as follows (in thousands):

The amounts above reflect properties classified as continuing operations, which means they are to be held and used in rental operations (income producing property).

We have several properties in development in our office and multifamily sectors. In the multifamily sector, Bennett Park was substantially completed in the fourth quarter of 2007, and The Clayborne Apartments were substantially completed in the first quarter of 2008. The cost of our real estate portfolio in development is illustrated below (in thousands):

We dispose of assets (sometimes using tax-deferred exchanges) that are inconsistent with our long-term strategic or return objectives and when market conditions for sale are favorable. The proceeds from the sales may be redeployed into other properties, used to fund development operations or to support other corporate needs, or distributed to our shareholders. Two office properties, Maryland Trade Centers I and II, were sold as of September 30, 2007 and initially classified as held for sale as of March 31, 2007. Two industrial properties, Sullyfield Center and The Earhart Building, were sold on June 6, 2008 and initially classified as held for sale in November 2007. They were sold for a contract sales price of $41.1 million that resulted in a gain on sale of $15.3 million.

Operating results of the properties classified as discontinued operations are summarized as follows (in thousands):

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

Operating results by property are summarized below (in thousands):

Our results of operations are dependent on the overall economic health of our markets, tenants and the specific segments in which we own properties. These segments include commercial office, medical office, retail, multifamily and industrial. All sectors are affected by external economic factors, such as inflation, consumer confidence, unemployment rates, etc., as well as by changing tenant and consumer requirements. Because the properties are located in the Washington metro region, the Company is subject to a concentration of credit risk related to these properties.

WRIT acquired the following properties during the first six months of 2008:

As discussed in Note 2, we allocate the purchase price to the related physical assets (land, building and tenant improvements) and in-place leases (absorption, tenant origination costs, leasing commissions, and net lease intangible assets/liabilities) based on their fair values, in accordance with SFAS No. 141, “Business Combinations.” Our acquisition of the properties listed above resulted in the recognition of $1.1 million in absorption costs and $0.2 million in leasing commissions, $0.6 million in tenant origination costs and $0.2 million in net intangible lease liabilities. The weighted average remaining life for these components are 57 months for tenant origination costs, 66 months for leasing commissions/absorption costs, and 49 months for net intangible lease liabilities. The results of operations from these acquired properties are included in the income statement as of their respective acquisition dates.

The purchases were funded with cash from operations and borrowings on our line of credit.

The following unaudited pro-forma combined condensed statements of operations present the consolidated results of operations for the 2008 Quarter and Period and the 2007 Quarter and Period, as if the above described acquisitions had occurred at the beginning of the period of acquisition and the same period in the year prior to the acquisition. The unaudited pro-forma information does not purport to be indicative of the results that actually would have occurred if the acquisitions had been in effect for the Quarters and Periods presented. The unaudited data presented is in millions, except per share data.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2008

(UNAUDITED)

NOTE 4: MORTGAGE NOTES PAYABLE

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Total carrying amount of the above mortgaged properties was $507.6 million and $449.3 million at June 30, 2008 and December 31, 2007, respectively. Scheduled principal payments for the remaining six months in 2008 and the remaining years subsequent to December 31, 2008 are as follows (in thousands):

NOTE 5: UNSECURED LINES OF CREDIT PAYABLE

As of June 30, 2008, we maintained a $75.0 million unsecured line of credit maturing in June 2011 (“Credit Facility No. 1”) and a $262.0 million line of credit maturing in November 2010 (“Credit Facility No. 2”).

Credit Facility No. 1

Credit Facility No. 1 replaced Credit Facility No. 3 (see below) on June 29, 2007. We had $15.0 million outstanding as of June 30, 2008 related to Credit Facility No. 1, and $14.5 million in Letters of Credit issued, with $45.5 million unused and available capacity. The balance under this facility was $70.0 million at December 31, 2007. During the second quarter of 2008, $37.0 million was repaid using a portion of the proceeds of the $90.5 million equity offering. WRIT has the option to further increase the capacity under the facility up to $200 million to the extent the bank agrees to provide the additional commitment.

Borrowings under the facility bear interest at our option of LIBOR plus a spread based on the credit rating on our publicly issued debt or SunTrust Bank’s prime rate. All outstanding advances are due and payable upon maturity in June 2011. Interest only payments are due and payable generally on a monthly basis. For 2008 Quarter and Period, we incurred interest expense (excluding facility fees) of $589,200 and $1,417,100, respectively, representing an average interest rate of 5.36% and 5.27% per annum, respectively.

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In addition, we pay a facility fee, based on the credit rating of our publicly-issued debt, currently equal to 0.15% per annum of the $75.0 million committed capacity, without regard to usage. Rates and fees may be adjusted up or down based on changes in our senior unsecured credit ratings. For the 2008 Quarter and Period, we incurred facility fees of $28,400 and $46,300, respectively. During the 2007 Quarter and Period, there were no borrowings, and no facility fees or interest expense were incurred on Credit Facility No. 1.

Credit Facility No. 2

We had no borrowings outstanding as of June 30, 2008 related to Credit Facility No. 2, and $0.9 million in Letters of Credit issued, with $261.1 million unused and available for subsequent acquisitions or capital improvements. At December 31, 2007, $122.5 million was outstanding under this facility. During the second quarter of 2008, $122.5 million was repaid, using a portion of the proceeds of the $90.5 million equity offering and the new mortgages of $81.0 million (see Note 4).

On January 25, 2008, WRIT exercised the right to increase the capacity of the unsecured revolving credit facility with a syndicate of banks led by Wells Fargo Bank, National Association from $200 million to $262 million. The maturity date and all other terms remain materially unchanged. WRIT has the option to further increase the capacity under the facility up to $400 million to the extent banks (from the syndicate or otherwise) agree to provide the additional commitment.

Advances under this agreement bear interest at our option of LIBOR plus a spread based on the credit rating on our publicly issued debt or the higher of Wells Fargo Bank’s prime rate and the Federal Funds Rate in effect on that day plus 0.5%. All outstanding advances are due and payable upon maturity in November 2010. Interest only payments are due and payable generally on a monthly basis. For the 2008 Quarter and Period, we incurred interest expense (excluding facility fees) of approximately $1,238,900 and $2,836,400, respectively, representing an average interest rate of 5.58% and 5.33%, respectively, per annum. For the 2007 Quarter and Period, we incurred interest expense (excluding facility fees) of approximately $1,341,600 and $1,817,800, respectively, representing an average interest rate of 5.81% and 5.79%, respectively, per annum.

Currently, Credit Facility No. 2 requires us to pay the lender a facility fee on the total commitment of 0.15% per annum. These fees are payable quarterly. For the 2008 Quarter and Period, we incurred facility fees of $99,300 and $192,500, respectively. For the 2007 Quarter and Period, we incurred facility fees of $76,000 and $151,000, respectively.

Credit Facility No. 3

Credit Facility No. 3 was replaced by Credit Facility No. 1 on June 29, 2007. Advances under this agreement bore interest at LIBOR plus a spread based on the credit rating on our publicly issued debt. There were no borrowings outstanding and payable under the facility upon the termination of the agreement in June 2007. Interest only payments were due and payable on a monthly basis. For the 2007 Period, we incurred $96,400 in interest expense (excluding facility fees) representing an average interest rate of 5.90%.

Credit Facility No. 3 required us to pay the lender a facility fee on the total commitment of 0.15% per annum, based on the credit rating on our publicly issued debt. These fees were payable quarterly. We incurred facility fees of $26,500 and $52,800 for the 2007 Quarter and Period, respectively.

Credit Facility No. 1 and No. 2 contain certain financial and non-financial covenants, all of which we have been met as of June 30, 2008.

NOTE 6: NOTES PAYABLE

On February 20, 1998, we issued $50.0 million of 7.25% unsecured notes due February 25, 2028 at 98.653% to yield approximately 7.36%. We also sold $60.0 million in unsecured Mandatory Par Put Remarketed Securities (“MOPPRS”) at an effective borrowing rate through the remarketing date (February 2008) of approximately 6.74%. On February 25, 2008, we repaid the $60 million outstanding principal balance under the MOPPRS notes. The total aggregate consideration paid to repurchase the notes was $70.8 million, which included $8.7 million for the remarketing option value paid to the remarketing dealer and accrued interest paid to the noteholders. Accordingly, WRIT recognized a loss on extinguishment of debt of $8.4 million, net of unamortized loan premium costs, upon settlement of these securities. WRIT refinanced the repurchase of these notes, and refinanced a portion of the line outstanding, by issuing the $100 million 2-year term loan described below.

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JUNE 30, 2008

(UNAUDITED)

On March 17, 2003, we issued $60.0 million of 5.125% unsecured notes due March 2013. The notes bear an effective interest rate of 5.23%. Our total proceeds, net of underwriting fees, were $59.1 million. We used portions of the proceeds of these notes to repay advances on our lines of credit and to fund general corporate purposes.

On December 11, 2003, we issued $100.0 million of 5.25% unsecured notes due January 2014. The notes bear an effective interest rate of 5.34%. Our total proceeds, net of underwriting fees, were $99.3 million. We used portions of the proceeds of these notes to repay advances on our lines of credit.

On April 26, 2005, we issued $50.0 million of 5.05% senior unsecured notes due May 1, 2012 and $50.0 million of 5.35% senior unsecured notes due May 1, 2015, at effective yields of 5.064% and 5.359% respectively. The net proceeds from the sale of the notes of $99.1 million were used to repay borrowings under our lines of credit totaling $90.5 million and the remainder was used for general corporate purposes.

On October 6, 2005, we issued an additional $100.0 million of notes of the series of 5.35% senior unsecured notes due May 1, 2015, at an effective yield of 5.49%. $93.5 million of the $98.1 million net proceeds from the sale of these notes was used to repay borrowings under our lines of credit and the remainder was used to fund general corporate purposes.

On June 6, 2006, we issued $100.0 million of 5.95% unsecured notes due June 15, 2011 at 99.951% of par, resulting in an effective interest rate of 5.96%. Our total proceeds, net of underwriting fees, were $99.4 million. We used the proceeds of these notes to repay advances on one of our lines of credit.

On July 26, 2006, we issued an additional $50.0 million of the series of 5.95% unsecured notes due June 15, 2011 at 100.127% of par, resulting in an effective yield of 5.92%. Our total proceeds, net of underwriting fees, were $50.2 million. We used the proceeds of these notes to repay borrowings under our lines of credit and to fund general corporate purposes.

On September 11, 2006, we issued $100.0 million of 3.875% senior convertible notes due September 15, 2026. On September 22, 2006, we issued an additional $10.0 million of the 3.875% senior convertible notes due September 15, 2026, upon the exercise by the underwriter of an over-allotment option granted by WRIT. The notes were issued at 99.5% of par, resulting in an effective interest rate of 4.000%. Our total proceeds, net of underwriting fees, were $106.7 million. We used the proceeds of these notes to repay borrowings under our lines of credit and to fund general corporate purposes.

On January 22, 2007, we issued an additional $135.0 million of the 3.875% senior convertible notes due September 15, 2026. On January 30, 2007, we issued an additional $15.0 million of the 3.875% senior convertible notes due September 15, 2026, upon the exercise by the underwriter of an over-allotment option granted by WRIT. The notes were issued at 100.5% of par, resulting in an effective interest rate of 4.003%. Our total proceeds, net of underwriting fees, were $146.0 million. We used the proceeds of these notes to fund the acquisition of 270 Technology Park and a portion of the acquisition of Monument II, to repay borrowings under our lines of credit, and to fund general corporate purposes.

The senior convertible notes are convertible into shares of our common stock, at the option of the holder, under specific circumstances or on or after July 15, 2026, at an initial exchange rate of 20.090 shares of common stock per $1,000 principal amount of notes. This is equivalent to an initial conversion price of $49.78 per share, which represents a 22% premium over the $40.80 closing price of our shares at the time the September 2006 transaction was priced and a 21% premium over the $41.17 closing price of our shares at the time the January 2007 transaction was priced. Holders may convert their notes into shares of our common stock prior to the maturity date based on the applicable conversion rate during any fiscal quarter if the closing price of our common stock for at least 20 trading days in the 30 consecutive trading day period ending on the last trading day of the immediate preceding fiscal quarter is more than 130% of the conversion price per share on the last day of such preceding fiscal quarter. The initial conversion rate is subject to adjustment in certain circumstances including an adjustment to the rate if the quarterly dividend rate to common shareholders is in excess of $0.4125 per share. In addition, the conversion rate will be adjusted if we make distributions of cash or other consideration by us or any of our subsidiaries in respect of a tender offer or exchange offer for our common stock, to the extent such cash and the value of any such other consideration per share of common stock validly tendered or exchanged exceeds the closing price of our common stock as defined in the note offering. Upon an exchange of notes, we will settle any amounts up to the principal amount of the notes in cash and the remaining exchange value, if any, will be settled, at our option, in cash, common shares or a combination thereof. The senior convertible notes could have a dilutive impact on our earnings per share calculation in the future. However, these notes are not dilutive for the 2008 and 2007 Quarters or Periods, and are not included in our earnings per share calculations.

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On or after September 20, 2011, we may redeem the notes at a redemption price equal to the principal amount of the notes plus any accrued and unpaid interest, if any, up to, but excluding, the purchase date. In addition, on September 15, 2011, September 15, 2016 and September 15, 2021 or following the occurrence of certain change in control transactions prior to September 15, 2011, holders of these notes may require us to repurchase the notes for an amount equal to the principal amount of the notes plus any accrued and unpaid interest thereon.

On February 21, 2008 we entered into a $100 million unsecured term loan (the “2010 Term Loan”) with Wells Fargo Bank, National Association. The 2010 Term Loan has a maturity date of February 19, 2010 and bears interest at our option of LIBOR plus 1.50% or Wells Fargo’s prime rate. To hedge our exposure to interest rate fluctuations on the $100 million note, we entered into an interest rate swap, which fixed the LIBOR portion of the interest rate on the term loan at 2.95% through February 2010. The current interest rate, taking into account the swap, is 4.45% (2.95% plus 150 basis points) on a notional amount of $100 million. The interest rate swap agreement will settle contemporaneously with the maturity of the loan. This swap qualifies as a cash flow hedge as discussed in Note 1.

The following is a summary of our unsecured note borrowings (in thousands):

The required principal payments excluding the effects of note discounts or premium for the remaining six months in 2008 and the remaining years subsequent to December 31, 2008 are as follows (in thousands):

Interest on these notes is payable semi-annually, with the exception of the 2010 Term Loan, on which interest is payable monthly. All of the notes include certain non-financial covenants, and the non-convertible notes also include certain financial covenants, with which we must comply. The financial covenants include limits on our total debt, limits on our secured debt, limits on our required debt service payments and maintenance of a minimum level of unencumbered assets. We were in compliance with all of our note covenants as of June 30, 2008.

The covenants under the line of credit agreements require us to insure our properties against loss or damage in the amount of the replacement cost of the improvements at the properties. The covenants for the notes require us to keep all of our insurable properties insured against loss or damage at least equal to their then full insurable value. We have an insurance policy which has no terrorism exclusion; however, our financial condition and results of operations are subject to the risks associated with acts of terrorism and the potential for uninsured losses as the result of any such acts. Effective November 26, 2002, under this existing coverage, any losses caused by certified acts of terrorism would be partially reimbursed by the United States under a formula established by federal law. Under this formula the United States pays 85% of covered terrorism losses exceeding the statutorily established deductible paid by the insurance provider, and insurers pay 10% until aggregate insured losses from all insurers reach $100 billion in a calendar year. If the aggregate amount of insured losses under the Act exceeds $100 billion

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during the applicable period for all insured and insurers combined, then each insurance provider will not be liable for payment of any amount which exceeds the aggregate amount of $100 billion. On December 26, 2007, the Terrorism Risk Insurance Program Reauthorization Act of 2007 was signed into law and extends the Program through December 31, 2014.

NOTE 7: BENEFIT PLANS

Share Options and Grants

Options

In March 2007, the WRIT Board of Trustees adopted, and in July 2007 WRIT shareholders approved, the Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan (“2007 Plan”). This plan replaced the Share Grant Plan, which expired on December 15, 2007, as well as the 2001 Stock Option Plan and Stock Option Plan for Trustees. As described above, the shares and options granted pursuant to the above plans are not affected by the adoption of the 2007 Plan. However, if an award under the Share Grant Plan is forfeited or an award of options granted under the Option Plans expires without being exercised, the shares covered by those awards will not be available for issuance under the 2007 Plan.

The 2007 Plan provides for the award to WRIT’s trustees, officers and non-officer employees of restricted shares, restricted share units, options and other awards up to an aggregate of 2,000,000 shares over the ten year period in which the plan will be in effect. If an award under the 2007 Plan of restricted shares or restricted share units is forfeited or an award of options or any other rights granted under the 2007 Plan expires without being exercised, the shares covered by any such award would again become available for issuance under new awards.

We adopted the Washington Real Estate Investment Trust 2001 Stock Option Plan to replace the 1991 Stock Option Plan that expired on June 25, 2001. The plans provided for the grant of qualified and non-qualified options. Options granted under the plans were granted with exercise prices equal to the market price on the date of grant vested 50% after year one and 50% after year two and expire ten years following the date of grant. We adopted the Washington Real Estate Investment Trust Stock Option Plan for Trustees in March 1998. Options granted to trustees were granted with exercise prices equal to the market price on the date of grant and were fully vested on the grant date. The last option awards to officers were in 2002, to non-officer key employees in 2003 and to trustees in 2004.

The 339,000 options outstanding at June 30, 2008, all of which are exercisable, have exercise prices between $14.47 and $33.09, with a weighted-average exercise price of $25.23 and a weighted average remaining contractual life of 4.0 years. The aggregate intrinsic value of outstanding exercisable shares at June 30, 2008 was $1.6 million. The aggregate intrinsic value of options exercised in the 2008 Period was $1.1 million. There were no forfeitures of options in the 2008 Period.

Share Grants, Performance Share Units and Restricted Share Units

We maintained a Share Grant Plan for officers, trustees, and other members of management.

In 2004 and 2005, awards were granted to officers and other members of management in the form of restricted shares, with a value equal to various percentages of a participant’s salary based upon WRIT’s performance compared to an appropriate benchmark target, with minimum and maximum thresholds. The awards were valued based on market value at the date of grant. Shares vest ratably over a five year period from the date of grant.

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In December 2006, the WRIT Board of Trustees approved a program providing for the granting of restricted share units to officers and other members of management and performance share units to officers based upon various percentages of their salaries and their positions with WRIT. For officers, one-third of the award is in the form of restricted share units that vest twenty percent per year based upon continued employment and two-thirds of the award is in the form of performance share units. Performance targets are set annually based on appropriate benchmarks with minimum and maximum thresholds. The performance share unit awards are based on cumulative performance over three years, and will cliff vest at the end of the three year period. For other members of management, 100% of the award will be in the form of restricted shares that vest 20% per year from date of grant based on performance targets. WRIT’s Chairman and former CEO was excluded from long-term awards under the program in view of his announced intention to retire in 2007. With respect to the performance share units, which are based on three-year cumulative performance targets set at the beginning of each year, the grant date does not occur until all such targets are set and thus the significant terms of the award are known. Because payouts are probable, the Company estimates the compensation expense at each reporting period, until the grant date occurs and as progress towards meeting target is known, and recognizes this expense ratably over the three-year period. The estimated expense related to the 2006 performance share units is approximately $1.6 million, of which $128,000 and $154,000 were recognized during the 2008 Quarter and Period, respectively. The 2006 estimate is based on the stock price on the grant date that coincides with the date that the three-year target was approved. The estimated expense related to the 2007 performance share units at the end of the three-year period is approximately $1.7 million, with minimal expense recognized during the 2008 Quarter and Period. The estimated expense related to the 2008 performance share units at the end of the three-year period is approximately $1.7 million, of which $105,000 and $269,000 were recognized during the 2008 Quarter and Period, respectively. Participants who terminate prior to the end of the three-year performance period forfeit their entire portion of the award. There were 2,734 restricted share units awarded to other members of management in February 2008. Effective in 2007 under the Long Term Incentive Plan, elected deferrals of short term incentive awards by officers are converted into restricted share units which vest immediately on the grant date and WRIT will match 25% of the deferred short term incentive in restricted share units, which vest at the end of three years. Dividends on these restricted share units are paid in the form of restricted share units valued based on the market value of WRIT’s stock on the date dividends are paid. WRIT granted 4,783 restricted share units to officers in 2007 pursuant to elective short term incentive deferrals. Performance and restricted share units awarded were valued at a weighted average price per share based upon the market value on the date of grant, as follows:

In May 2007, the value of the restricted shares awarded to trustees was increased to $55,000 from $30,000. These shares vest immediately and are restricted from sale for the period of the trustee’s service.

The following are tables of activity for the quarter ended June 30, 2008 related to our share grants and restricted share unit grants.

Share Grants

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There were no shares granted during the 2008 Period. The total fair value of shares vested during the Period ending June 30, 2008 is $0.6 million. As of June 30, 2008, the total compensation cost related to non-vested share awards not yet recognized was $0.9 million, which is expected to be recognized over a weighted-average period of 14 months on a straight-line basis.

Restricted Share Units