HUD does not allow you to enlarge any windows or doors, add weight to the roof, or to replace any wall material with something heavier (for example, replacing paneling with drywall).

Once it was inspection time, we found out that the heater was an old oil furnace that no longer worked and the top and back roof needed a new rubber roof.

Secondly, I have a lot 2 blocks away that had a home on it but I razed it because the roof collapsed in and the water damage was serious. 

Having 1 lawn, 1 boiler, 1 water heater, 1 roof is great!

Roof, mechanicals, pool liner, etc.

There's clearly a leak from the chimney so the walls and roof will need to be ripped out, roof replaced, all rooms updated.

I've had work done on the building itself (roof repairs) and remodeling work in one of my previously vacant units last year. 

It's an older home and the large items (windows, roof, HVAC) haven't been updated in many, many years so one of those items would put the property in the red fairly quickly.It is not a substitute for a thorough rental analysis.

I racked up my no interest for a year credit cards a little.

There was a bad roof leak, so he replaced the roof in 2018, and replaced the rotten wood and ceiling.