Hi....after 81st Street and Broadway, Sesame Street moved to much the much smaller Unitel Studio on 9th Avenue and 50th (not certain of cross st.) which is not there anymore. I remember visiting Kermit Love there a few times in the early 80's and thinking how cramped it was to get the entire set in that space. At Reeves Teletape on 81st, the set would remain up while live action or Muppet segments were shot in front of the cyc stage to the right of Big Bird's nest. The studio on 9th Ave. could barely accomodate this. They soon moved to Astoria. Also, a couple of talk shows shared the 9th Ave. studio, I think Montel. Anyway, neither studio is there anymore sad. I pass by 81st everyday on my way to work at 57th Street. It's now a condo building with a Staples out front, although the old front entrance (when it used to be a theater), is still there having been incorporated into the new building's lobby entrance...very nice.
One other thing, when CTW decided to move The Electric Company from Metromedia Ch. 5 studios (now Fox NY) to 81st St., the cast of TEC balked at the idea because CTW wanted to tape each show in 2 "shifts" each to accomodate the season show supply. This turned out to be bad for the actors because their hiatus would be shortened and leave them little time in between shifts to do other things. They (the actors) lost out, and TEC moved into 81st St. its second season and this saved CTW lots of $$. CTW had a sweet production deal with Reeves at the time.
-RT