Where was Bree's apartment?

Google "Scenes From the City- New York"

It's a site by the Mayor's office and has shooting locations for a good chunk of all American films shot in New York post-1950.

"I never dreamed that any mere physical experience could be so stimulating!" -The African Queen

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Hell's Kitchen.

West 43rd Street: http://www.movie-locations.com/movies/k/klute.html

I actually called the Buckley Funeral Home (located two doors down from Bree's walk-up) back around 1980 and they were able to give me the address:

441 W. 43rd Street
New York, N.Y.
10036

The person I spoke to at the funeral home still remembered the filming a decade later and had no problem telling me the address. I actually wrote it down in my own address book, since I never throw those things out, so I'd never lose it. Good thing, too, as who would have thought that I would end up needing it 33 years later?!

Also ... the number you see on the dial of the phone in her apartment would probably be 212-689-7363.

So there you have it, folks. Everything but the actual apartment number.

Note: According to some Google search results, the Buckley Funeral Home is still at the same location: 445 West 43rd Street. Other hits show 424 West 51st Street.