At closing did the title commitment note exceptions? What was discussed in your attorney review period prior to closing? Did you agree to purchase the property "as-is"? What terms were negotiated?
There's likely more to the story than what we see here. You should consult with your attorney that you used to purchase the property and maybe also the group that issued your title insurance.
If you need a lawyer I suggest you contact Erik Miles at 312-854-8092 as his rates are reasonable.
You own the property now and inspectors do not care about language in your purchase contract. They are more concerned about what the city's system says about the address. First step, find out what the system says, once you have that info you can bring to someone that specializes in helping solve these types of problems and that person might be an attorney.
Tim did give you great advice. You do need to talk to an attorney! I personally know of a situation where permits hadn't been pulled and a fire occurred in the area that was rehabbed. When the insurance company looked into they found out no permits had been pulled for the rehab and the owner was left to flip the bill for the reconstruction.
Manuel Brown, Broker
Sounds like someone did not do all their homework.