John F. Hennessey, principal of GVA Thompson Doyle Hennessey & Everest represented BlackRock in the transaction. The move is part of BlackRock's worldwide expansion. The NY-based company has offices in Delaware, San Francisco, Tokyo, Hong Kong and Scotland.

The company says that it considered a number of locations in the city's financial district but chose One Boston for its central location, its proximity to clients and other financial services providers, its cooperative building ownership and an attractive economic lease package.

The 802,205-sf, 41-story building is owned by Walton Street Capital, LLC and Blackstone Real Estate Advisors. Among its other office tenants are First UnionRobinson & Cole, American Association of Retired Persons, The Boston Co., Boston Capital Partners, H.C. Wainwright, Davis, Malm & D'Agostine, International Forest Products, Berkshire Partners and Cambridge Strategic Management, which leases another floor in the building.

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