Keystone Building

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 27th-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
General information
Type	Office
Location	99 High Street, Boston, Massachusetts
Coordinates	42.35415°N 71.05443°W / 42.35415; -71.05443
Completed	1971
Height
Roof	400 ft (120 m)
Technical details
Floor count	32
Design and construction
Architect	Pietro Belluschi with Emery Roth & Sons
Developer	Daniel 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]