Talk:El Chemistri/@comment-23.243.9.200-20161022044407/@comment-26143371-20161120105924

Not the only one. I'm not too familiar with the show itself, but I think at least the following are also from the Heights, but appeared before:
 * Burns Manor
 * Fat Tony's Compound
 * Quimby Compound
 * Wolfcastle's Mansion

By the time they were released, the developers most likely just didn't think that there would be a Springfield Heights Expansion. Additionally some of those buildings would have been too important to leave out of the game for many years anyway.