You remodeled it at some point and added a new roof and HVAC system and that was all in for 50k.

Ross:Here are my thoughts:1) "As is" basically says to me they do not intend to give a discount because you suddenly realized the roof needs replacing. 

I once went to look at a purchase and the owners' ice maker line was leaking on the floor.

It is basically a new house except the roof, which is metal and does not leak).

I know in my tiny village three business owners recently received grants $100K (think they match) for outsideimprovements (windows, parking, roofing, patio)  Must be nice; that's what I want! 

 - bitcoin mining can be energy intenseIn addition, I want tenants to report any leaks as soon as discovered.  

There must be a cause for mold growth, and that cause is almost always moisture.Check there are no roof leaks or attic window leaks.

I've sold rentals before and almost always was asked for a copy of my Sch E.Also during the due diligence and inspection, try to talk to the tenants directly to confirm how much they pay, and also if there are known issues that haven't been repaired (roof leaks, frozen pipes in the same area every winter, etc).

This year we had a heat pump cleaning, testing refrigerant charge (didn't need any added) and a capacitor replacement, bill was $157.05, factor I consider are the age of the existing unit, if it needed a charge, potential leak, cost of refrigerant (over the years there have been many varients of the type of refrigerant). 

His roof ‘inspection’ was done with binoculars and he missed almost a 5k repair that was fairly urgent—so you may not want to use that co. either.