The problem is trying to use a percentage of a moving target to supply needed cash that is very specific. 

Some of the outside on/off shut off valves for the water supply were "frozen"The roof has some missing shingles from wind damage and missing rubber gaskets around piping that protrudes through the roof which allows water to get inside the attic.This is a question for anybody who wants to chime in.What other due diligence should I be conducting for an off-market seller financed 6 unit apartment building that comes with an adjacent vacant parcel? 

. ;)They are deductible, and it really does not matter what you call them - supplies, furnishings, maintenance, decorations. 

Assuming the supply lines don't need any modification besides adding the two sub meters you would probably be looking at around 300-400 for an install.

The current inventory here is quite low, 0.6 months of supply.

Here's a quick version of what's gone on: supply (particularly of condos) in Miami was up prior to Covid.

Less money spent on supplies, less wear and tear on your place, less money spent on utilities, fewer guest headaches, etc.Bottom line: there’s a LOT of puzzle pieces you have to get right to make this work really well, but once you master it, it can be very rewardingI preferred to invest in the year-round high revenue parts of the US where you can earn a lot of money year-round.

The interest will get away from them and they'll lose their home.All other investors will be able to quickly, efficiently pay down the HELOC, use only what they need, and have a constant supply of cash on hand to offer and purchase properties.

That said, I CAN tell you that we are seeing both material and labor costs increase dramatically due to COVID as well as supply chain shortages on building materials.

Real Estate is local, supply cannot be moved from one State to another if needed.