Dude, you need to chill out. You can't expect a half a dozen replies in 3 hours. Give it at least a day before you start bitching.
There's plenty of people who still care about GTA III, myself included, but we can't be on 24/7.
Open MEd, find the zone, find the name of the building, search the name in the ide file, and see what txd it directs you to.