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Table of Contents 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 : 001-37949 Innovative Industrial Properties , Inc. ( Exact name of registrant as specified in its charter ) Maryland ( State or other jurisdiction of incorporation or organization ) 1389 Center Drive , Suite 200 , Park City , UT 84098 ( Address of principal executive offices ) Title of Each Class Common Stock , par value $ 0.001 per share Series A Preferred Stock , par value $ 0.001 per share Securities registered pursuant to Section 12 ( b ) of the Act : 81-2963381 ( I.R.S. Employer Identification No. ) ( 858 ) 997-3332 ( Registrant's telephone number ) Non - accelerated filer Name of Each Exchange on Which Registered New York Stock Exchange 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 . YES þ NO □ Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15 ( d ) of the Exchange Act . YES NO þ Indicate by check mark whether the Registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Exchange Act 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 þ 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 ( Section 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 þ NO □ Indicate by check mark whether the Registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . Large accelerated filer þ 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 accounting 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 the Registrant is a shell company ( as defined in Rule 12b - 2 of the Exchange Act ) . YES NO The aggregate market value of the common stock held by non - affiliates of the Registrant was approximately $ 2.2 billion , based upon the last reported sale price of $ 123.56 per share on the New York Stock Exchange on June 28 , 2020 , the last business day of the Registrant's most recently completed second quarter . As of February 25 , 2021 , there were 23,926,317 shares of common stock outstanding . DOCUMENTS INCORPORATED BY REFERENCE Portions of Innovative Industrial Properties , Inc.'s Proxy Statement with respect to its 2021 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant's fiscal year are incorporated by reference into Part III hereof .