ITEM 8.01: OTHER EVENTS

This Current Report on Form 8-K ("8-K") updates Washington Real Estate Investment Trust's ("we" or "WRIT") Annual Report on Form 10-K for the fiscal year ended December 31, 2008 ("2008 10-K"), initially filed on March 2, 2009. For the avoidance of doubt, WRIT is not filing this 8-K to correct any error or omission in financial or other information previously filed in the 2008 10-K. The changes to the 2008 10-K included in this 8-K reflect the adoption of recently-adopted accounting standards on a retrospective basis, as follows:

• the retrospective application of the January 1, 2009 adoption of FASB Staff Position No. APB 14-1 ("FSP 14-1"), Accounting for Convertible Debt Instruments that may be Settled in Cash Upon Conversion;

• the retrospective application of the January 1, 2009 adoption of SFAS No. 160 ("FAS 160"), Noncontrolling Interests in Consolidated Financial Statements;

• the retrospective application of the January 1, 2009 adoption of FASB Staff Position No. EITF 03-6-1 ("FSP 03-6-1"), Determining Whether Instruments Granted in Share-Based Payment Transactions are Participating Securities; and

• the reclassification of certain amounts to discontinued operations in accordance with SFAS No. 144 ("FAS 144"), Accounting for Impairment or Disposal of Long-Lived Assets, as a result of a property classified as held for sale subsequent to December 31, 2008.

Item 9.01 of this 8-K updates the information contained in our 2008 10-K to
reflect the impacts of the items described above. Updates provided in this 8-K are contained in Part I, Item 1, "Business"; Part II, Item 6, "Selected Financial Data"; Part II, Item 7, "Managements' Discussion and Analysis of Financial Condition and Results of Operations"; Part II, Item 8, "Financial Statements and Supplementary Data"; Exhibit 12, "Computation of Ratio of Earnings to Fixed Charges"; and Schedule III.

The financial Statements and other information included in this 8-K are incorporated by reference herein and supersede the corresponding financial statements and other corresponding information in our 2008 10-K. As well, such financial statements and other information included in the exhibits to this 8-K are incorporated by reference in our currently effective registration statements. Except as specifically noted, this 8-K does not update for other changes since the filing of our 2008 10-K. For significant developments since the filing of our 2008 10-K, refer to subsequent 2009 Quarterly Reports on Form 10-Q.

ITEM 9.01: FINANCIAL STATEMENTS AND EXHIBITS

Exhibits 12. Computation of Ratio of Earnings to Fixed Charges 23. Consent of Independent Registered Public Accounting Firm 99.1 Business 99.2 Selected Financial Data 99.3 Managements' Discussion and Analysis of Financial Condition and Results of Operations 99.4 Financial Statements and Supplementary Data 99.5 Schedule III

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