Old Buildings

Your only hope is they are re-introduced at the next holiday. Depending on what the designers decide to do, they could be relics gone forever once the event ended. Like the racing car to celebrate season 24 - there won't be a season 24 again, so there is no need to reintroduce it. As for a list of items - search the threads for the walk-throughs from each event. Christmas, Halloween, Episode tie-ins, etc.