Find out what state agency regulates condominium associations. In NJ it's the Dept. of Community Affairs. Try googling "Condominium state regulations Calif." for instance and see what you get.

From my experience, the MASTER DEED filed with the Condominium documents spells out everything, including the common areas.
It would depend on the wording or the master deed and possible state regulations, but, usually, at least here in NJ, the member/unit owner's interest begins on the interior wall surface. The studs, siding, roof, etc, etc are common elements. If your building/unit has structural problems it's likely the Association's property and responsibility to repair.
I'm assuming you live in a condominium, with common areas, not merely a Homeowners association with more limited responsibilites.
Get the master deed and review it. You as a member are entitled to it.

The old timers usually think they own the place.....

BTW, does your association have a reserve for major repairs and replacements??

Good luck.