HFF 10-K 2017 FY Annual report

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO SECTION 906 OF

THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of HFF, Inc. (the “Company”) onForm 10-K for the period ending December 31, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark D. Gibson, Chief Executive Officer of the Company, and Gregory R. Conley, Chief Financial Officer of the Company, each certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Dated: February 28, 2018

By:	/s/    Mark D. Gibson
	Mark D. Gibson
	Chief Executive Officer
	(Principal Executive Officer)

Dated: February 28, 2018

By:	/s/    Gregory R. Conley
	Gregory R. Conley
	Chief Financial Officer
	(Principal Financial and Accounting Officer)