1155 F Street

This twelve-story office building incorporates the rehabilitation and renovation of four adjacent historic structures.

Situated on a half-block site in downtown Washington, D.C., the design introduces an atrium space between the new building and the historic structures, allowing both old and new to retain their architectural integrity even as they are linked by bridges at every floor.

The challenge was to provide a subtle but modern aesthetic that would be a respectful partner to the more elaborate and articulated language of the older buildings. The response includes carefully proportioned expanses of glass, stone, and metal in a warm palette of limestone and bronze that complements the materiality of the existing buildings. Projecting sunshades recall their fine detail in a contemporary way, and a sharp-edged cornice completes the new structure with an abstracted reference to the past.

Show Facts

F Street between 11th and 12th streets


260,000 ft2 / 24,000 m2 gross area; offices, atrium/lobby, retail space


CarrAmerica Development, Inc.; Douglas Development Corporation

PCF&P Services

Architecture, exterior envelope, interior design of public spaces



lead designers

Henry N. Cobb
Bruce White


Award for Excellence in Historic Preservation.
American Institute of Architects, District of Columbia Chapter, 2010

Awards for Excellence in Historic Preservation: Excellence in Design: Restoration/Rehabilitation and New Construction
District of Columbia, 2009

A six-story atrium links new and existing buildings beneath a 110-foot skylight. The restored rear elevations of the historic structures become a backdrop for this dramatic space, which features structural steel bridges connecting the curtain wall system to the existing masonry buildings.
Project Credits

Associate Architect: HKS, Inc.; Preservationist: EHT Traceries Inc.; Structural: Tadjer-Cohen-Edelson Associates, Silver Spring, MD; Mechanical / Electrical / Plumbing /FP: Girard Engineering, PC; Images: Alan Karchmer