POWER OF ATTORNEY

	Know all by these presents, that the undersigned
hereby constitutes and appoints each of Matthew J. Mallow,
Christopher J. Meade, Daniel R. Waltcher and R. Andrew Dickson III
of BlackRock, Inc. (the ?Company?), or any of them signing singly, and
with full power of substitution, the undersigned's true and
lawful attorney-in-fact to:


	(1)prepare, execute in the undersigned's name and on the
undersigned's behalf, and submit to the U.S. Securities and Exchange
Commission (the "SEC") a Form ID, including amendments thereto, and any other
documents necessary or appropriate to obtain codes and passwords enabling
the undersigned to make electronic filings with the SEC of reports
required by Section 16(a) of the Securities Exchange Act of 1934 or any rule or
regulation of the SEC;

	(2)execute for and on behalf of the undersigned, in the undersigned's
capacity as an officer and/or director of the Company, Forms 3, 4,
and 5 in accordance with Section 16(a) of the Securities Exchange Act
of 1934 and the rules thereunder;

	(3)do and perform any and all acts for and on behalf of the
undersigned which may be
necessary or desirable to complete and execute any such Form 3, 4, or 5,
complete and execute any amendment or
amendments thereto, and timely file such form with the SEC and any stock
exchange or similar authority; and

	(4)take any other action of any type whatsoever in connection
with the foregoing which, in
the opinion of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the
undersigned, it being understood that the documents executed by
such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such
attorney-in-fact may approve in such attorney-in-fact's discretion.

	The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise
of any of the rights and powers herein granted, as fully to all intents
and purposes as the undersigned
might or could do if personally present, with full power of substitution or
revocation, hereby ratifying
and confirming all that such attorney-in-fact, or such attorney-in-fact's
substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney
and the rights and powers herein granted.
The undersigned acknowledges that the foregoing attorneys-in-fact,
in serving in such capacity at the request
of the undersigned, are not assuming, nor is the Company assuming
any of the undersigned's responsibilities
to comply with Section 16 of the Securities Exchange Act of 1934.

	This Power of Attorney shall remain in full force and effect
until the undersigned is no longer
required to file Forms 3, 4, and 5 with respect to the undersigned's
holdings of and transactions in securities
issued by the Company, unless earlier revoked by the undersigned in a
signed writing delivered to the foregoing
attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has caused this Power of
Attorney to be executed as
of this 20th day of November 2015.

			/s/ Mark McCombe
			______________________
			 Mark McCombe