Exhibit 99.2

Third Quarter 2008

Supplemental Operating and Financial Data

for the Quarter Ended September 30, 2008

Company Background and Highlights

Third Quarter 2008

Washington Real Estate Investment Trust (the “Company”) is a self-administered, self-managed, equity real estate investment trust (REIT) investing in income-producing properties in the greater Washington metropolitan region. WRIT is diversified, as it invests in multifamily, retail, industrial/flex, office, and medical office properties.

During third quarter 2008, WRIT focused on leasing its development projects and capitalizing on opportunities to recycle capital. In addition, WRIT continued to strengthen its balance sheet by issuing more than $100 million of equity, which it used to pay down all of its short-term variable rate debt, subsequent to quarter-end. Finally, WRIT paid its quarterly dividend for its 187th consecutive quarterly dividend at equal or increasing rates.

On September 3, 2008, WRIT acquired The Kenmore, a 374-unit, 269,000 square foot apartment building located in Washington, DC for $58.3 million. The property was acquired for $155,750 per unit, less than half of estimated replacement cost. With an excellent location, proximate to the intersection of Military Road and Connecticut Avenue in the affluent Upper Northwest submarket, WRIT expects steady rental rate growth and significant leasing demand. WRIT expects to achieve a first-year, unleveraged yield of 6.2% on a cash and GAAP basis. The acquisition was funded with borrowings on WRIT’s line of credit and cash from operations.

This quarter WRIT executed two leases totaling 154,000 square feet at Dulles Station West, Phase I. International Business Machines Corp. (NYSE: IBM) will occupy 123,000 square feet and National Student Clearinghouse will occupy 31,000 square feet, resulting in an 86% leased rate. Dulles Station West, Phase I is a 180,000 square foot, six-story office building prominently located on the Dulles Toll Road, less than one mile from Washington Dulles International Airport. Last year, the building received the Northern Virginia NAIOP’s Award of Excellence for Best Suburban Mid-Rise Office Building. The building is part of a mixed-use development which will include over one million square feet of office space, two hotels, 1,095 multifamily units and 56,000 square feet of retail and restaurant space.

Bennett Park is a ground-up development project in Arlington, VA consisting of high-rise and mid-rise Class A apartment buildings with a total of 224 units and 5,800 square feet of retail space, completed in fourth quarter 2007. The property was 71% leased at quarter-end 9/30/08.

The Clayborne is a ground-up development project in Alexandria, VA, adjacent to our 800 South Washington retail property, completed in first quarter 2008. The project consists of a 74-unit Class A apartment building that will include 2,700 square feet of additional retail space. The property was 55% leased at quarter-end 9/30/08.

On August 28, 2008, WRIT entered into a Sales Agency Financing Agreement with BNY Mellon Capital Markets, LLC. Under the agreement, WRIT may offer and sell up to $150 million of common shares for a period of no more than 36 months. As of September 30, 2008, WRIT had issued an aggregate of 1,141,410 shares for $41.2 million in gross proceeds through this agreement. Subsequent to the quarter-end on October 1, 2008, WRIT completed a $60.4 million equity offering of 1.725 million common shares at a price of $35.00 per share. WRIT used the net proceeds from both offerings to repay borrowings under its lines of credit and for general corporate purposes. On September 30, 2008, WRIT paid its quarterly dividend of $0.4325 per share for its 187th consecutive quarterly dividend at equal or increasing rates.

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On October 14, 2008, WRIT announced the appointment of William “Bill” T. Camp as Executive Vice President and Chief Financial Officer - Elect effective November 12, 2008. Mr. Camp will succeed Sara L. Grootwassink as EVP/CFO as she plans to resign due to a personal relocation to the West Coast. He brings sixteen years of finance and capital markets experience to WRIT, serving most recently as Vice President, Assistant Director of Equities at Wachovia Securities, LLC.

WRIT is a self-administered, self-managed, equity real estate investment trust investing in income-producing properties in the greater Washington metro region. WRIT’s dividends have increased every year for 38 consecutive years. WRIT owns a diversified portfolio of 92 properties consisting of 27 office properties, 22 industrial/flex properties, 17 medical office properties, 14 retail centers, 12 multifamily properties and land for development. WRIT shares are publicly traded on the New York Stock Exchange (NYSE:WRE).

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Net Operating Income Contribution by Sector - Third Quarter 2008

With investments in the multifamily, retail, industrial/flex, office and medical office segments, WRIT is uniquely diversified. This balanced portfolio provides stability during market fluctuations in specific property types.

Third Quarter 2008 Acquisition and Purchase Agreement

Acquired:

The Kenmore

Washington, DC

Certain statements in this press release and the supplemental disclosures attached hereto are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements involve known and unknown risks, uncertainties and other factors that may cause actual results to differ materially. Such risks, uncertainties and other factors include, but are not limited to, fluctuations in interest rates, availability of raw materials and labor costs, levels of competition, the effect of government regulation, the availability of capital, weather conditions, the timing and pricing of lease transactions and changes in general and local economic and real estate market conditions, and other risks and uncertainties detailed from time to time in our filings with the SEC, including our 2007 Form 10-K. We assume no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

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Supplemental Financial and Operating Data

Table of Contents

September 30, 2008

Certain statements discussed in this Supplemental regarding anticipated operating results and future events are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Although such statements and projections are based upon what we believe to be reasonable assumptions, actual results may differ from those projected. Key factors that could cause actual results to differ materially include changes in the economy, the successful and timely completion of acquisitions, changes in interest rates, leasing activities and other risks associated with the commercial real estate business and as detailed in our filings from time to time with the Securities and Exchange Commission.

Consolidated Statements of Operations

(In thousands, except per share data)

(unaudited)

Note: Certain prior quarter amounts have been reclassified to conform to the current quarter presentation.

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Consolidated Balance Sheets

(In thousands)

(unaudited)

Note: Certain prior quarter amounts have been reclassified to conform to the current quarter presentation.

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Funds From Operations and Funds Available for Distribution

(In thousands, except per share data)

(unaudited)

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Earnings Before Interest Taxes Depreciation and Amortization (EBITDA)

(In thousands)

(unaudited)

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Long-Term Debt Analysis

(In thousands, except per share amounts)

Note: The current balance outstanding of the fixed rate bonds and notes is shown net of discounts/premiums in the amount of $1,127,023.

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Long-Term Debt Analysis

(In thousands, except per share amounts)

Continued from previous page

Weighted average maturity = 7.7 years

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Capital Analysis

(In thousands, except per share amounts)

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Core Portfolio Net Operating Income (NOI) Growth & Rental Rate Growth

2008 vs. 2007

Cash Basis

GAAP Basis