Only time it's fun to get into the mansion is during a party anyway, rest of the time it's just dirty old men sitting around trying to hit on the models who are staying there at the time.
You want to find hot models, go to the one of several pools at one of several LA hotels... you'll have to figure out which ones for yourself, I can't give out all the secrets...
(here's a hint: just pick one of your Standard old hotels).