If you can concretly tie increased usage to that unit, I would give a notice that rent is increasing due to excessive use.

They did not request anything needed, and the home was not advertised as ADA accessible upon their move in.

Looks like a bunch of concrete rubble or something.

I sold a beachfront home last year that was ICF constructed in 2000 with a metal roof on concrete pilings and the insurance went up triple what my larger 2019 stick built with shingle roof 6 lots down is. 

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The responses from some Real Estate “professionals” in this thread explains why real estate agents and representatives wear the badge of honor of being nosey, careless, borderline illegal and non-compliant with the most basic regulations and elemental  ethics.

I got real estate in my blood or more like concrete.

According to the IRS guidelines, mobile homes set on concrete blocks and that are always capable of being moved from their sites on their own wheels are considered personal property (5 year).  

The onsite-manager’s unit had a concrete floor which sometimes got wet from water coming over the sill in big storms.

Same for a collapsed sewer pipe - they won't pay for the repair to the pipe, but they do need to pay for the damages caused to access that pipe like removing flooring, drywall, concrete, etc.