What about heat and AC, are they all separate units or a central system?

We normally don’t buy investment condos since the cash on cash return is normally low due to the HOA fees but there is something to be said about not needing to worry about the exterior, heat, hot water, snow removal, or landscaping.

I am responsible for water, heat (gas or oil), common area electricity. 

I have a building that is killing me on heat - which I provide.

Unit has central air/heat with programmable thermostat.Laundry (full washer and dryer) is conveniently located in upstairs hall outside bedrooms.

Great if you plan on using pool heating as an optional upgrade 

The the sellers can properly make an educated decision, but then how many people would want to buy a house where the foundation is end of life and to fix it is a 20k expense.The void wall is not that big of a deal as long as the home can properly cool or heat, which I believe just roof insulation and the right tonnage will accomplish. 

Hi Chris.Gas + solar heating is fairly economical.

Other potential requirements are size (10'X10' as one example), having a closet, having heating to the room, having proper electrical outlets in the room, etc.Look up your local municipality building codes to ensure you have it as a legal room with permits so it can be added to the assessed details/title.

New appliances, water heat & softener, roof (hail from 2018 got me a new one for under $1200).