NYC Tax photographs from 1939 and 1941 for sale...

Between 1939 and 1941, the city photographed every house and building in the five Boroughs. Copies of these unique images are now avaliable for purchase

http://mail.elliman.com/exchweb/bin/redir.asp?URL=http://www.nyc.gov/html/records/html/taxphotos/home.shtml

These could make an amazing closing gift.... Let them know that you care