2055 L Street, NW

Vertical expansion and renovation of a seven-story, existing cast-in-place concrete office building originally constructed in 1964. The single-story, 103,000 sf addition is framed with steel and incorporates the existing penthouse into the new office level. The added level brings the main roofline of the building to a similar height of the adjacent buildings.

Elevators were extended and stairs added to serve the new level. A large amount of mechanical equipment was relocated to a new, screened, high-roof equipment area. The new curtain wall enclosing the addition is designed to blend with the existing façade below. The added level features an outdoor terrace and trellis.