Do you mean the New School for Social Research a/k/a the New School. Like most of out of towners you'll probably have to get used to saying that properly and saying House-ton street instead of Hyooston street. :-)
I've been organizing a little Workout Of the Month in the park. No Oly Lifts though...sorry. Nonetheless, you're welcome to join us when you get here. I have only found one gym that has platforms and that's Peak Performance. However, I heard a rumor that Equinox has platforms and Kettlebells at one of their locations. Some of the universities have platforms but they are usually for varsity teams and not open to the public.
As for jiu-jitsu, I recommend Renzo's. www.renzogracie.com
. Renzo also has a kettlebell and kettleclub so you can get some workouts in too.