Not a major fix, but something that did need to be addressed.Small roof issue which was just missing about 6 shingles, but its exposed wood so would need to be repaired right away.The overall condition of the outside of the house, I would want to reside the house within 2-3 years. 

The estimate to replace look SUPER expensive, if it's just asphalt shingles.

Also most attics are finished as a "hot roof" - insulated tight against the sheeting, but often not well done, rather warm in the summer, also shortening the life of the shingles, making roof leaks hard to detect and costly to repair.None of these issues apply on a real 3 unit, which was built this way.

I should’ve torn the roof off and replaced it with shingles.

Some have separate siding and half done shingles, because separate owners live on each side.

Treat it like a business. find you a cpa who understands what you are doing and get computerized it will help you and your cpa.

A condo association would insure more than just the roof shingles  and exterior coating...they cover  framing, sub structures, etc.  

The computerized CMAs are not accurate as they can't track the nuances between which houses are really comps.

New metal shingles, new windows, new bathrooms, new kitchens, etc.

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?