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Table of Contents ☑ ☐ 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 the 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 Number 001-09279 ONE LIBERTY PROPERTIES , INC . MARYLAND ( Exact name of registrant as specified in its charter ) ( State or other jurisdiction of Incorporation or Organization ) 60 Cutter Mill Road , Great Neck , New York ( Address of principal executive offices ) 13-3147497 ( I.R.S. employer Identification No. ) 11021 ( Zip Code ) Registrant's telephone number , including area code : ( 516 ) 466-3100 Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , par value $ 1.00 per share Securities registered pursuant to Section 12 ( g ) of the Act : NONE Trading Symbol OLP Name of exchange on which registered New York Stock Exchange Indicate by check mark if the registrant is a well - known seasoned issuer as defined in Rule 405 of the Securities Act . Yes No ☑ Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 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 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 . 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 , a small reporting company or an emerging growth company . See definitions of " large accelerated filer , " " accelerated filer , " " small reporting company " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer Accelerated filer Non - accelerated filer Smaller reporting company Emerging growth company If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether registrant is a shell company ( defined in Rule 12b - 2 of the Act ) . Yes □ No ☑ As of June 30 , 2020 ( the last business day of the registrant's most recently completed second quarter ) , the aggregate market value of all common equity held by non - affiliates of the registrant , computed by reference to the price at which common equity was last sold on said date , was approximately $ 278 million . As of March 1 , 2021 , the registrant had 20,732,353 shares of common stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of the proxy statement for the 2021 annual meeting of stockholders of One Liberty Properties , Inc. , to be filed pursuant to Regulation 14A not later than April 30 , 2021 , are incorporated by reference into Part III of this Annual Report on Form 10 - K .