sentences:  Armsmear was listed as a National Historic Landmark in 1976; this designation was expanded in 2008 to form the Coltsville Historic District, a National Historic Landmark District.Armsmear was planned for Colt's 1856 marriage to Elizabeth Hart Jarvis, and constructed in 1856 to designs by an unknown architect, possibly local architect Octavius Jordan or factory engineer H. A. G. Pomeroy, on grounds overlooking the recently completed Colt Armory.It was described by a contemporary thus