The Cairo apartment building, located at 1615 Q Street NW in Washington, D.C., is a landmark in the Dupont Circle neighborhood and the District of Columbia's tallest residential building. Designed by architect Thomas Franklin Schneider and completed in 1894 as the city's first "residential skyscraper", the 164-foot (50 m)-tall brick building spurred local regulations and federal legislation limiting building height in the city that continue to shape Washington's skyline.