IMO, chances are bawal yan unless patago mo gamitin which is kinda hard. You'll have to refer to the deed of restrictions and your building admin. Definitely you cannot piggy it onto your condo wiring system so if ever, it will be genset where appliances or lights will be directly plugged into.

The question would be, is it worth it? Usually the condo genset should work for most occasions given that is supposed to be tested and maintained regularly.