One Liberty Properties (OLP) 10-Q 2011 Q1 Quarterly report

EXHIBIT 32.1

CERTIFICATION OF PRESIDENT AND CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. 1350

(SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002)

I, Patrick J. Callan, Jr., do hereby certify, pursuant to 18 U.S.C. 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that based upon a review of the Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2011 of One Liberty Properties, Inc. (“the Registrant”), as filed with the Securities and Exchange Commission on the date hereof (the “Report”):

(1)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date:	May 9, 2011	/s/ Patrick J. Callan, Jr.
		Patrick J. Callan, Jr.
		President and
		Chief Executive Officer