240 West 47th Street (just West of Broadway).
Apparently the old ballroom of the Art Deco Edison Hotel. ibdb.com lists productions there between 1970 and 1990, including the notorious nude show Oh, Calcutta. Productions also listed there as the Arena Theatre in 1950-51, although not certain whether that is correct. Currently home to The Supper Club, a 650-seat restaurant with live shows.