Owner of other side of shared duplex is unreachable.. Issue.

[Jose Leija]

I have a property I purchased which is just a half duplex. The property seemed rent ready but I just discovered major plumbing issues on a slab foundation. I knew it had foundation issues because they were obvious but I taught I'd get those fixed with time. I've tried to contact the owner of the other side for over a week now but doesn't answer phone calls. What are my options? It's a 2 bed 2 bath but with the plumbing problem I won't be able to use the master bath which is the most spacious. I cant get renters in there like that.