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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 COMMISSION FILE NO . 001-06622 WASHINGTON REAL ESTATE INVESTMENT TRUST ( Exact name of registrant as specified in its charter ) Maryland ( State of incorporation ) 53-0261100 ( IRS Employer Identification Number ) 1775 EYE STREET , NW , SUITE 1000 , WASHINGTON , DC 20006 ( Address of principal executive office ) ( Zip code ) Registrant's telephone number , including area code : ( 202 ) 774-3200 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) WRE Securities registered pursuant to Section 12 ( g ) of the Act : None Title of each class Shares of Beneficial Interest Name of each exchange on which registered NYSE No Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes No 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 12 months ( or such shorter period that the registrant was required to file such reports ) and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes 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 , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act .