Interestingly, it is not illegal to take pictures of people who are in their private property provided you are in a public space and the subjects of the photographs are not engaged in an activity for which they might reasonably expect privacy (like bathing, dressing, intimacy etc etc).
However, if you are on their private property when doing it, it’s trespass.
As for taking pictures of people on private property from common property, my guess (and it’s only a guess) is that you’d need the permission of the owners corp, as common property is not a public space. But then the OC would have to be the ones who complained if you did.