You need to rent at fair market value and if you fail do so, you are still taxed as if you charged full rent. 

But just as important is having a secondary way to get into the house if the lock fails for any reason.

If your seller fails to get a CO then you can't get the house most likely, depending on financing, since its uninhabitable.If the seller changes the setup to comply with the codes then you're SOL unless your attorney says otherwise.

Then, if they failed to cure the violation after that, I could file for eviction. 

Failing that, go back and read the contract and see if you might have any recourse against the Seller. 

The IRS waived penalties for QOFs who fail to meet their 90% asset test in June and December 2020. 

How in the world was I supposed to be informed that they switched their payment plans, when they failed to inform us on purpose.

Sometimes the fixtures and part used then can fail, that can be expensive in all sincerity

This house is basically a failed flip, and the owners seem desperate to sell, probably to pacy back loans. 

Lessons learned from that deal:1) Don't buy master-metered gas (when it failed I solved it by bringing in propane tanks).2) Manage master-metered electric very carefully (didn't even know what it was until the whole power system lit on fire one day).3) No pay/no stay is the only way to go on collections.