As a CCIM, I use Site to Do Business which is a very robust application and has a lot of special info used to look for markets for users and look for comparative demographics to successful markets they may already be in. 

In June 2018 we bought an updown duplex for $625,000 ($289/square foot) with a 3.5% FHA out of a HELOC from our previous primary residence.

If you are able to bill back utilities to tenants based on their actual usage, then it stand to reason that the tenants will consume less gas, water, etc... than if the LL is footing the bill.

In terms of cap ex, I usually see $200 per unit or $.25 a square foot. 

What I am looking to do is to start wholesaling just to get my foot in the door.

I am curious if its better to have an open large building to store boats/ snowmobiles/cars etc and charge so much per linear foot or have individual units?

That could only happen with robust business processes in place and I would still need to manage the manager.

Title installed should cost no more than $4 per foot includes cost of tile (2.5 labor, 1.5 tile).  

market for square footage is roughly after repairs would be245 So we’re getting it for $65 a square foot and the area market is $119 a square foot in good repair

For more rental income per square foot, its easily the duplex.