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( MARK ONE ) UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 □ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 FORM 10 - K TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from 001-13106 ( Essex Property Trust , Inc. ) 333-44467-01 ( Essex Portfolio , L.P. ) ( Commission File Number ) ESSEX PROPERTY TRUST , INC . ESSEX PORTFOLIO , L.P. Maryland ( Essex Property Trust , Inc. ) California ( Essex Portfolio , L.P. ) ( State or Other Jurisdiction of Incorporation or Organization ) OR ( Exact name of Registrant as Specified in its Charter ) Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , $ .0001 par value ( Essex Property Trust , Inc. ) to 1100 Park Place , Suite 200 San Mateo , California 94403 ( Address of Principal Executive Offices including Zip Code ) ( 650 ) 655-7800 ( Registrant's Telephone Number , Including Area Code ) Trading Symbol ( s ) ESS 77-0369576 ( Essex Property Trust , Inc. ) 77-0369575 ( Essex Portfolio , L.P. ) ( I.R.S. Employer Identification Number ) Name of each exchange on which registered New York Stock Exchange Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Essex Property Trust , Inc. Yes No Essex Portfolio , L.P. Yes No Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Essex Property Trust , Inc. Yes Essex Portfolio , L.P. Yes No No