PARK AVENUE PLAZA COMPANY, L.P. c/o Fisher Brothers

Exhibit 10.31

PARK AVENUE PLAZA COMPANY, L.P.

c/o Fisher Brothers

000 Xxxx Xxxxxx

Xxx Xxxx, XX 00000

dated as of July 29, 2004

BlackRock, Inc.

00 Xxxx 00xx Xxxxxx

Xxx Xxxx, XX 00000

Re: Agreement of Lease dated July 29, 2004 between Park Avenue Plaza Company, L.P. and BlackRock, Inc. for premises at 00 Xxxx 00xx Xxxxxx, Xxx Xxxx, XX (the “Lease”)

This letter agreement shall serve to amend the Lease. Initially-capitalized terms used herein shall have the same meanings ascribed to such terms in the Lease.

Notwithstanding anything to the contrary contained in the Lease, but subject to the provisions of Section 1.8 of the Lease, the parties hereto agree that:

(i) the “Commencement Date” shall mean August 1, 2004;

(ii) the “Rent Commencement Date” shall mean May 1, 2005; and

(iii) the fixed annual rent (but not the real estate tax escalations or Expense Payment) shall be further abated for the thirty-one (31) day period commencing on the Rent Commencement Date.

Except as modified by this letter agreement, the Lease shall remain unmodified and in full force and effect.

Very truly yours,
PARK AVENUE PLAZA COMPANY, L.P.
By:		Xxxxxx Plaza Special Corporation, a
		general partner
By:		/s/    Xxxxxxx X. Xxxxxx
		Name: Xxxxxxx X. Xxxxxx
		Title: President
ACCEPTED AND AGREED:
BLACKROCK, INC.
By:		/s/    Xxxxx X. Xxxxxxx
		Name: Xxxxx X. Xxxxxxx
		Title: Managing Director