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 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.