What is Uncle Bill and the kid's address on the show?

I don't recall the precise address, but I think it was on 62nd street. Right?

Close enough.. The answer is 600 E 62nd St. Mr. French gave the address when he was enrolling the twins in school, in one of the first episodes.

Unsurprisingly, 600 E. 62nd Street does not exist, but such an address would be in the East River if 62nd street went there. I think they got that trick from I Love Lucy, in which the address was 623 E. 68th Street. The same result-- in the River.

Interesting info there! So where is the building that we see at the start of each segment of the show? Probably L.A. Any comments?

Hi! This building is an actual building in NY as they shot the exterior shots of the front of the building on location. The rest were shot on a shoundstage in LA.