--Hepburn at 244 East 49th Street and Dylan at 242. Hepburn had lived at the address since 1931 when she rented the townhouse with her husband Ludlow Ogden Smith. Following her divorce from "Luddy", Hepburn bought the four-story house and still owned it when she died in 2003. (She lived there until the 1990s and then retired permanently to her other home in Connecticut.) The rented house which Dylan lived in was once owned by screenwriters Garson Kanin and Ruth Gordon. Kanin and Gordon were good friends of Hepburn's, and in 1951 when the house came up for sale, they bought it and were Hepburn's neighbours for some 40 years.
Back to neighbour Dylan. While living next door to Hepburn, at one time he invited her to join the graduation party of his daughter. By way of invitation, Dylan wrote Hepburn a brief note (as seen below) saying she'd be quite welcome to join the party. Apparently, Hepburn never showed [source].
Via: big apple dayze
Dear Katharine Hepburn
My daughter is having a graduating party in the rented house next door to you, (the one with the dog)
It will be from 7:30 to 10- if you could stop by, you'd be most welcome