Officially, the address of this New York landmark is 245 East 73rd, but this location is as fictional as 123 Sesame Street. (Ernie and Bert???s building being the other make-believe brownstone I still somewhat believe in.) Even though I know deep down ???Sex and the City??? was a TV show and Sarah Jessica Parker is an actress (and a savvy one at that, parlaying the fashionable series into a series