Turnkey companies that have experience and a good track record should never warranty tenant caused damage.

I was thinking of asking for a key or having the unit owner sign a document releasing me from any liability or damage that is caused by my inability to access the utility room.  

Many foundation problems have water as a root cause - be that infiltration in a crawl space, drainage around the site, cracked sewer line or water line.

The big hole abt 32 inches deep is the sump pump which may have caused the cracking to the foundation outside. 

@Nathan GrubbTotal guess: Sometimes when the house/bathroom is warm, the cold water will cause condensation on the toilet tank.

Inspectors here often call out a reverse grade sloping back towards the home as possibly causing water to drain towards the home and thus into the crawl space or basement. 

Careful if you ask me a question 'cause I'll talk your ear right off.Good luck!

There are A LOT OF TRAPS along the way that can/will make the deal fall through (and cause you to lose your earnest money).

However, you also want to be able to demonstrate that intent.Factors that would give credibility to your claim could include your normal practice, communications you had with professionals and your relatives as you were buying it, and the specific reasons that would cause you to change your intent from holding to resale.These types of things happen. 

The "someone with rentals can't have a home office" Is LITERALLY the final argument that caused me to quit working for a CPA firm.