Some online detective work indicates that the folks on the leases (both units) live somewhere else and different people live in the units now. 

I don't really want to use self leveler since it's directly to the side of a doorway, so I think any slight grading would still be detectable and possibly become a trip hazard.

They will send a detective to start an investigation.

But other info, like whether there's a mortgage on the property, can only be had by going to the clerk's office.Once you verify who owns the property, you will have to continue to play detective. 

During inspection of the premises i should be able to detect the smell of cat's urine on the floor.

Keep in mind there are all sorts of levels and types of security systems and they can have different purposes (Deter, detect, deny, and control entry are all different types of systems).

Awesome detective work recognizing there was a tenant conversation on Nextdoor👍Maybe stir it up with her broker after closing.

You use the existing 2 wire with gfci protection it trips if a short is detected.  

You don't need to play detective to see who's right or wrong.

(I'm detecting that it may have already had an effect-am I right?)