(We do clean the grills, routinely) For central HVAC systems, dryer vents, kitchen and bathroom exhaust vents, they do indeed need duct cleaning periodically based on actual buildup of grease, lint, or other drek. 2) If the exposed grills were actually dirty at move in, or if there was any indication/conversation regarding sensitivity/asthma or similar concerns, and depending on just how dirty the ducts are, I might consider having the ducts cleaned, except for #3.3) Check local law, but you should be able to simply "non-renew", with no reason.

I imagine a lot has changed in this area since then.I actually drove by the Trout Farm Inn last summer, unfortunately it had just been burned down from a kitchen fire.

Still have to find other money for roof, hvac, appliances, hot water heater, bathroom and kitchen remodels.

You would say how lovely the one bed/one bath is. with is luxury vinyl plank, granite counters, and stainless steel appliances.

We rehabbed the interior by installing nicer floors, kitchen cabinetry and overhauled the showers.

Too much to explain here, but park owned homes due to turn over, damage, stolen appliances, wrecked ACs etc you bairly make a nickle on the home rent.  

What is he estimating for demolition, for plumbing, for electrical, for painting, for HVAC, for cabinets, for appliances, for flooring, for the roof, etc.?

Latest codes require these in areas near water sources; aka kitchens and baths.

We rehabbed the interior by installing nicer floors, kitchen cabinetry and overhauled the showers.

I guess it's well known that a good kitchen and bathrooms go a long way.