Nothing personal, but housing in that area back in the day was illegal. Technically, you could place a house on that island and nearby teleport area, but on Chess staff kept deleting them (that's my recollection). I don't know why on earth they didn't prohibit placement on server side, but the fact still stands: there should be no houses on that island, I don't remember seeing them there and I found no search matches for "temple island house" on rec.games.computer.ultima.online.
This somewhat backs up my statement:

Source: Aschulze Travelogues [he played on Cats], http://www.aschulze.net/ultima/stories/story036.htm
Please correct me if I'm wrong, but I'm pretty sure about this one.