Personally what I have seen people do is the vinyl fence from street view and a nice chainlink for the perimeter. 

I would like to be inside the perimeter though with a 4 plex.

These units are built into a one story house, so only 2 of the 4 perimeter walls have windows.

I haven't done a project like this, but I have always wondered if you are using existing footings (or are those new, cant tell, concrete looks a little clean to be original) and then you are keeping the existing perimeter stem wall/ and some framing.

I became interested in this deal after months of driving and learning areas within the perimeter and understanding the path of city development that I see forming.

I became interested in this deal after months of driving and learning areas within the perimeter and understanding the path of city development that I see forming.

Is waterproofing around the exterior perimeter of the house a good option in my case?

I'm just south of Atlanta but deal with a lot of properties inside the perimeter.

Overall, the heat pumps make the space feel very comfortable by pushing heat into the middle of the rooms instead of heating the perimeter like baseboard heating systems. https://www.efficiencymaine.com/at-home/heating-cost-comparison/

Even within those perimeters you'll see significant differences in the potential returns, so the sooner you get some real numbers the better.