Constitution Square Office Buildings 3 and 4

Balfour Beatty completed base building and tenant improvements for a GSA tenant on a tight site.

Balfour Beatty completed base building and tenant improvements for a GSA tenant on a tight site.

Washington, D.C.
Stonebridge Associates, Inc.
$100M - $700M
LEED Platinum and LEED Gold
Market Type
Corporate Office, Federal, Green Building

Constitution Square Office Building 3 (OB3) Tenant Improvements for a GSA tenant involved the build-out of a new 12-story, 365,000-gross-square-foot Class-A office building. The work included level-IV security counter measures and a 21,000-square-foot SCIF space. The project included 29,000-square-foot flexible floor plates, extensive meeting and conference spaces, fitness center, HVAC central plant, rooftop amenity spaces, and a shared plaza.

Constitution Square Office Building 4 (OB4) Base Building and Tenant Improvements totals 538,302 square feet for a GSA tenant, with a 106,834-square-foot basement and green roof. It features 13 stories of office space and two levels of below-grade parking with 263 spaces. The tenant build-out incorporated advanced security measures, a 2,000-square-foot SCIF space, and extensive meeting and conference spaces.

OB4 was designed to meet a Facility Security level-IV which included a glazing performance condition of 3b for the first four floors. The exterior precast skin was enhanced accordingly to sustain the required loads for this level of protection. The façade of the building is made up of curtainwall at the southeast corner of the building, with architectural precast and punch windows on the rest of the façades. As part of the project, sections of the existing south façade on OB3 to the north were removed to allow OB4 to tie-in at floors two through seven.

The tight site included elevated WMATA tracks on one side (it is adjacent to the Metropolitan Branch Trail and the Washington Metropolitan Area Transit Authority’s (WMATA) NoMa-Gallaudet Red Line metro station) and existing buildings on two other sides.

The base building is LEED Platinum certified and the tenant space of both OB3 and OB4 are certified LEED Gold.