The historic site saw limited growth prior to the 1850s, although a number of "firsts" also occurred in the area. James Greenleaf, an early land speculator in the city, erected the first buildings (six row houses) on Pennsylvania Avenue in the spring and summer of 1794 at the corner of Pennsylvania Avenue NW and 22nd Street NW, and another seven similar buildings were erected about the same time by General Walter Stewart. The "Six Buildings" erected by Greenleaf served as the first headquarters of the United States Department of State and the United States Department of the Navy in 1800, while one of the buildings across the street housed the United States Department of War. Two of the city's first three street lamps were established in the area near Capitol Hill in December 1801.