The plumbing could have lead supply lines and galvanized supply lines, and the waste lines could be clay, "Orangeburg" (Black coal-tar impregnated fiber piping), and even cast iron waste can develop cracks especially if the lines go unused for long periods.

Ryan,If you can fix your moisture problem with the above mentioned sealants, I think your best bet is to patch the spall in the bottom face of the slab with concrete and then provide some sort of strapping system (steel/carbon fiber) in the short direction of the porch on either side of it.  

We placed it over the existing tar roof using fiber insulation boards.

Have that fearful tenant hop on their smart phone and use their 5G or Fiber wi-fi connection to livestream you (and inspector if relevant) as they walk through the property and look at what you need them to look at.

I can’t speak to the numbers since I have not seen complete plans and specs and finishes level of construction site conditions etc. but overall they look average for a typical straightforward project with vinyl siding or fiber cement siding shingle roof mid grade level of finish.  

They still have pile height, but the traffic areas have 'clumped' fibers, instead of those individual fibers you see on new carpet.It's always when the house is vacant that tenants notice these things.

I wouldn't depend on their high moral fiber to do the right thing. 

For example, a quick google search of your guest could turn up a lot of information such as their dietary requirements, hobbies and interests, birthdays etc.

@Andrew Bertram: You should not remediate but coat it with a very secure and thick paint that seals in all the asbestos fibers, which are the source of the problem.

Down on hands and knees, scraping dog urine soaked carpet fibers and glue out of a wood deck....