1、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 31,2017 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)OF THE SECURITIES EXCHANGE
2、ACT OF 1934 For the transition period from to Commission File Number 001-33097 _ GLADSTONE COMMERCIAL CORPORATION(Exact name of registrant as specified in its charter)_ Maryland 02-0681276(State or other jurisdiction of incorporation or organization)(I.R.S.Employer Identification No.)1521 Westbranch
3、 Drive,Suite 100 McLean,Virginia 22102(Address of principal executive offices)(Zip Code)(703)287-5800(Registrants telephone number,including area code)Securities registered pursuant to Section 12(b)of the Act:(Title of each Class)(Name of each exchange on which registered)Common Stock,$0.001 par val
4、ue per share Nasdaq Global Select Market 7.75%Series A Cumulative Redeemable Preferred Stock,par value$0.001 per share Nasdaq Global Select Market 7.50%Series B Cumulative Redeemable Preferred Stock,par value$0.001 per share Nasdaq Global Select Market 7.00%Series D Cumulative Redeemable Preferred S
5、tock,par value$0.001 per share Nasdaq Global Select Market 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 NO Indicate by check mark if the registrant is not requi
6、red 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 for such shorter period that the regi