In 1791 or 1792 (accounts vary), Craigie purchased the Vassall House and farm, comprising approximately 150 acres, which had served as Washington’s headquarters during the war. The house came to be known as the “Craigie Mansion,” and later through its most famous tenant as the "Longfellow House," and which today is known as the
Longfellow House–Washington's Headquarters National Historic Site. The house served as a social center of Cambridge. Craigie installed gardens, a greenhouse and an icehouse, and held numerous parties and dances at what was described as his "princely bachelor’s establishment." The parties continues, with guests that included Queen Victoria’s father and the French diplomat Talleyrand, among many others. The original toll bridge became toll-free in 1858 and was replaced by the current
Charles River Dam Bridge in 1910. The new bridge, situated next to the Museum of Science, is still referred to as Craigie's Bridge by many. As the area now known as
Lechmere Square in East Cambridge grew, Craigie was able to exert significant influence over the areas development. The construction of the bridge prompted the laying out of roads to the center of Cambridge (now Cambridge Street, running to Harvard Square) and Somerville/Medford (Bridge Street, now Monsignor O'Brien Highway/Massachusetts Route 28). Craigie and his associates, who formed the Lechemere Point Corporation, benefited from the building boom that followed, spurred on by their efforts to expand the public street grid. Their rerouting of roads to steer traffic toward what was originally a toll bridge, however, was criticized by some at the time. Craigie was also fundamental in convincing Middlesex County authorities to move the
Middlesex County Courthouse (Massachusetts) from Harvard Square to a new
Charles Bulfinch-designed building in East Cambridge. ==Later years==