I'm trying to confirm the final replacement property identification deadline because the IRS issued a Disaster Notice that may extend my 45 day deadline.My qualified intermediary says they will not confirm the IRS notice applies or whether the 45 day date they gave me is overridden by the notice.

During your initial walkthrough, inspect the property for any major issues such as structural damage, roofing problems, plumbing, and electrical concerns, while documenting all cosmetic and functional issues with detailed photos and notes.Once you confirm the property’s potential, finalize your ARV and calculate the repair costs using either a reliable estimator or insights from contractors.

Your expert (the plumber) couldn't confirm the cause.

During Buyer's title search, it was identified that there is no Certificate of Occupancy (CofO) for the home confirming it is a legal 2 family. 

You need to do testing before renovation and after to confirm that all mold remediation was either done by a company if the area is still there.

Quote from @Connor Williams: Thanks for the confirmation everyone.

The plumber will likely have to cut open the ceiling to confirm and make repairs, so you can save a little money by learning how to do that yourself, confirm the problem, and then call the plumber for repair, then patch the ceiling yourself.As Jonathan is trying to point out, it's important to expect these things and have funds on hand to deal with them.

Wait until the move-out date and confirm she's gone, then handle turnover like normal.

I conducted title searches to confirm there are no liens and double-checked with the county to ensure there are no outstanding debts.

Why buy something that is new with active and confirmed contamination underneath it.