Built by John Jacob Astor in the 1820s, this 21-foot-wide brick townhouse is available for sale for the first time in 65 years. This 5 bedroom, 3 1/2 bathroom  single-family  home spans approximately 3,950 sqft. (with an additional 1,651 sqft. in unused FAR), has beautiful original moldings and unique pre-war details throughout, a large private backyard and  sits on an expansive 21'...