99 High Street, previously known as the Keystone Building, is a high-rise office building located in downtown Boston, Massachusetts.[1] The building stands at 400 feet (122 m) with 32 floors. Construction began in 1969[2] and was completed in 1971. In height, it is tied with Harbor Towers I as the 37th-tallest building in Boston. The building was the first development in Boston of the New York–based real estate firm Rose Associates, led by Daniel Rose,[3] who went on to develop One Financial Center and Boston Wharf. The original owners were Rose Associates (New York), Central & District Properties (London), and anchor tenant Keystone Custodial Funds.[2] The building is currently owned by TIAA-CREF.[1]

Keystone Building
Map
General information
TypeOffice
Location99 High Street, Boston, Massachusetts
Coordinates42°21′15″N 71°03′16″W / 42.35415°N 71.05443°W / 42.35415; -71.05443
Completed1971
Height
Roof400 ft (120 m)
Technical details
Floor count32
Design and construction
Architect(s)Pietro Belluschi with Emery Roth & Sons
DeveloperDaniel Rose (for Rose Associates)
Website
http://99highboston.com/

The Keystone Building was developed as the flagship headquarters for Keystone (which was subsequently acquired and rebranded by Wells Fargo). To that end, Rose engaged architect Pietro Belluschi, a leader of the Modern Movement in architecture, to design the building's notable exterior, featuring distinctive rounded corners and grooved façade. Belluschi worked with the architectural firm of Emery Roth & Sons, who developed the construction drawings and interiors.[4]

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