1800 Massachusetts Avenue is a LEED Platinum certified, 194,165 square-foot building located one block east of Dupont Circle. The newly renovated building features a state-of-the-art conference center on floors one and two, a fitness facility on the lower level, and retail on the first floor. It serves as the DC headquarters building for the Service Employee International Union (SEIU). Joining SEIU at 1800 Massachusetts are the United Nations Foundation, the Better World Campaign, and the Center for Global Development.
Located in the Dupont Circle neighborhood, 1800 Massachusetts Avenue has been recognized as a "Walker's Paradise" by WalkScore.com.
1800 Massachusetts Avenue is an EPA ENERGY STAR labeled property.