It's a 1961 concrete block house.  

I would check to make sure you are Dodd Frank compliant.  

So until I have a more concrete business plan I'm just kind of doing my own research and learning as much as I can here before embarrassing myself in person!

Though both Fair Housing, and ADA protect the disabled and an arguement could be made that an obese person is a disabled person.

I figure that if I spend $15k said and done all expenses included to get a mobile duplex on to-code concrete piers, I should be able to recoup that in a year and a half.

The building is concrete block and previous owners built on the side of it another "Wooden frame" store front which is "attached".Each unit is being rented out under market value, and decent condition.The property does not have a CO (calling town this week) but is in working condition and fully rented out. which is strange?

As of now, my PM has had all the work completed except for the lead clearance, as we cannot paint the outside at the moment due to the cold weather.The thing is that since the inspection the tenant is withholding rental, claiming the home is not compliant and as such cannot be legally rented out.

Separate out concrete?

I purchased a home that has a badly cracked front concrete and brick porch.

Factor in what has to be done for the exterior as it relates to your desired exit date: Paint, mud-jacking, concrete pour, roof, landscape, etc.