787 Seventh Avenue New York, NY 10019-6099 Tel: 212 728 8000 Fax: 212 728 8111

October 23, 2020

VIA EDGAR

Securities and Exchange Commission

100 F Street, NE

Washington, DC 20549

Re: Preliminary Proxy Materials for

BlackRock MuniHoldings Fund, Inc.

BlackRock Municipal Income Investment Quality Trust

BlackRock Municipal Bond Trust

BlackRock MuniHoldings Fund II, Inc.

BlackRock MuniHoldings Quality Fund, Inc.                            

Ladies and Gentlemen:

On behalf of BlackRock MuniHoldings Fund, Inc. (the “Acquiring Fund”), BlackRock Municipal Income Investment Quality Trust (“BAF”), BlackRock Municipal Bond Trust (“BBK”), BlackRock MuniHoldings Fund II, Inc. (“MUH”) and BlackRock MuniHoldings Quality Fund, Inc. (“MUS” and collectively with BAF, BBK and MUH, the “Target Funds”), we hereby transmit for filing with the Securities and Exchange Commission the preliminary proxy materials consisting of a Notice of Special Meeting of Shareholders and a Proxy Statement to be issued in connection with the Joint Special Meeting of Shareholders (the “Meeting”) of the Acquiring Fund and the Target Funds (collectively, the “Funds”). As set forth in more detail in the accompanying proxy materials, the Meeting is being held to approve an Agreement and Plan of Reorganization between each Target Fund and the Acquiring Fund and the transactions contemplated therein, as well as certain related proposals.

The enclosed proxy materials will be delivered to holders of each Fund’s preferred shares. The Acquiring Fund filed a Registration Statement on Form N-14 on August 6, 2020, which included a separate proxy statement/prospectus to be delivered to each Fund’s common shareholders.

Should members of the Staff have any questions regarding the enclosed materials, they should call the undersigned at (212) 728-8955.

Sincerely,

/s/ Bissie K. Bonner

Bissie K. Bonner

Enclosures

cc: Janey Ahn, Esq., BlackRock, Inc.

Dean A. Caruvana, Esq., BlackRock, Inc.

Elliot J. Gluck, Esq., Willkie Farr & Gallagher LLP

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