There is settling in our condo building

There is settling occurring in our 1946 condo building. It is causing un-levelness in the floors of the first floor unit (the second floor unit has some sloping, but not as severe as the first floor), with minor buckling of the floors. The unit sits right over the boiler that sits in the basement and as such has enclosed ceilings with fire proofing so we can't inspect the joists.

My question, is it the homeowners responsibility to pay for further investigation or the HOA (to include bringing in a structural engineer and also opening up the basement ceiling above the boiler unit.