I have a fixture where each unit has a wired bulb to each switch they are all put together in a pendant well the glass broke on the pendant and so I was wondering where they sell replacemts for the pendant or if I could wire something up

Before doing anything I would contract the condo people to ask if you can even touch this fixture.
I bet if it is communal to four units it is not your responsibility, nor would you be allowed to work on it.