601 Massachusetts Avenue

Washington, D.C.

This full-block, mixed-use development lies at the heart of Mt. Vernon Square along one of the city’s busiest avenues. The triangular site inspired an overlapping, L-shaped building with a large central atrium that defines the main entrance on Massachusetts Avenue. Roof terraces offer dramatic views of the Capitol Building and Washington Monument. The interlocking “L” plan configuration maximizes exterior wall access and ensures efficient office layouts. The two rooftop terraces allow upper floor occupants direct access to the outdoors.

The lobby’s cable suspended curtainwall system uses vertical stainless steel tension rods and steel pipe trusses, each fabricated and erected in one piece. The low-iron glass enclosure faces southwest to filter in daylight and merge the building with the city. Travertine wraps the lobby to encapsulate two distinct experiences—one upon entering from the street and the other when stepping from the elevators. At their axis is a twenty-foot freestanding white marble sculpture by Giovanni Balderi, which is visible to passersby.