You're better off training outside, honestly. There's nothing about a dance studio that would be beneficial, except maybe the sprung floor (if it's a proper dance studio). However in a "real" parkour environment; i.e. an urban or nature setting, you won't have a sprung floor anyhow, so the benefit of training on one is limited.
In terms of conditioning, I guess as M2 said a dance studio is as good as any other space. You can do pushups, L-sits, squats, etc. there just as well as anywhere else. You can even do L-sit pullups on the barres if they're free-standing as opposed to wall-mounted; although depending on your height you may not be able to get the full range of motion on the pullup.
I'd definitely read the FAQ page if I were you, and I'd suggest starting out training on playgrounds. There you have a lot of equipment for a lot of conditioning exercises and also for parkour skills training. A dance studio isn't bad, but it's not terribly good either. A playground is your best bet if you can't find a gym.
