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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 FORM 10 - K ( MARK ONE ) ✔ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1-12675 ( Kilroy Realty Corporation ) Commission file number 000-54005 ( Kilroy Realty , L.P. ) KILROY REALTY CORPORATION Kilroy Realty Corporation Kilroy Realty , L.P. KILROY REALTY , L.P. ( Exact name of registrant as specified in its charter ) Registrant Kilroy Realty Corporation Maryland ( State or other jurisdiction of incorporation or organization ) ( I.R.S. Employer Identification No. ) Registrant Kilroy Realty , L.P. Delaware ( State or other jurisdiction of incorporation or organization ) ( I.R.S. Employer Identification No. ) 12200 W. Olympic Boulevard , Suite 200 , Los Angeles , California , 90064 ( Address of principal executive offices ) ( Zip Code ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ .01 par value ( 310 ) 481-8400 ( Registrant's telephone number , including area code ) 95-4598246 95-4612685 Securities registered pursuant to Section 12 ( g ) of the Act : Name of each exchange on which registered New York Stock Exchange Title of each class Common Units Representing Limited Partnership Interests Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Kilroy Realty Corporation Yes No Kilroy Realty , L. P. Yes No Ticker Symbol KRC Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Act . Kilroy Realty Corporation Yes No Kilroy Realty , L. P. 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 for 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 . Kilroy Realty Corporation Yes No Kilroy Realty , L. P. Yes No Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site , if any , every Interactive Data File required to be submitted and posted 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 and post such files ) . Kilroy Realty Corporation Yes No Kilroy Realty , L. P. 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 the definitions of " large accelerated filer , " " accelerated filer " and " smaller reporting company " in Rule 12b - 2 of the Exchange Act .