Forbes Tower is the place at the corner of Dapitan and Lacson, right? That place is brand new, I think they just started housing people this school year.
Anyway, there's lots of housing available right outside the gates of UST, and there's one dorm one campus, but that dorm is actually a farther walk to the med building than most of the places outside of campus.
The Castle (on Dos Castillas) is pretty hard to get into (there's already a list of names for people who want to live there next year), but it's one of the better places around here, minus the fact that there's no elevator. There's Pacific Sun, which is pretty new I think. There's also the Galleria on P. Noval, which is nice...hmm, I can't really think of any other places right now.
All of those places are less than a 10 minute walk to the med building, and if you have any more questions, lemme know. 🙂
Hope to see you around UST next year!