Morris Adjmi Architects

One Hill South

575,000 square feet
13 stories, 383 units
Washington, D.C.

One Hill South is a new apartment building occupying half a block in Washington, D.C.’s Capitol Riverfront neighborhood. A checkerboard pattern of two-story projections distinguishes the glass mid-rise from the similarly scaled office and residential buildings in the quickly developing neighborhood.

One Hill South’s super-scaled staggered volumes are based on a unique interpretation of a local zoning allowance that permits projecting bays, more commonly seen in the form of vertical bay windows.

The building’s deceptively simple appearance belies its highly technical execution. Its façade functions as a window wall along the slabs at the top and bottom of each projection and like a curtain wall installed in front of the slabs between. Sections of the assembly are built from a carefully selected spandrel glass used to conceal One Hill South’s concrete structure and mechanical systems.

The regular rhythm of the vertical fins, which are finished with a custom “MA Gray” coating, gives the façade an added depth and sense of movement. At the street level, a metal canopy marks the residential entry on K Street and the ground floor is wrapped in a brick that complements the custom metal finish.

One Hill South's staggered projections create pairs of alternating floor plates, which provide a greater number of options for tenants interested in one of the 383 studios, one-, two-, and three-bedroom apartments arranged around the building’s central courtyard.

Each unit features open floor plans and luxurious finishes, including oak floors, walnut cabinetry, and marble surfaces. Resident amenities include a fitness center and private lounges with views onto the courtyard, as well as a large landscaped roof terrace featuring a swimming pool and outdoor dining areas.

Based on the success of One Hill South, MA was subsequently commissioned to design 10K Hill South—an adjacent multifamily building. This isometric illustrates One Hill South in the foreground and 10K Hill South in the back. Together, the "sister structures" complete the large Capitol Riverfront block, enclosing a landscaped courtyard and interior street.