But the lot is in a great spot although looking at the plat, on one, there is a 24ft driveway easement that cuts through diagonally, and on the other, the build lines on the plat / deed don't match AT ALL to what the house is on the lot.As I'm new to this, I can see the potential, but I have NO IDEA how to even get started on estimating something like this.  

We own the 4-unit diagonally to the rear of your Nov 2019 purchase. 

For square, electronic tape measure and diagonals across corners should be equal4) The stickiness of doors, windows, and sliders.5) Eyeball the roof for flatness.  

If you want to buy stock buy into the diversification and risk-parity like he estates.

So I plan to patch the cracks in the walls (some 1/8" or larger, diagonal from windows and door frames in one room, cracks appeared to be quite old), mud over the texture, scrape off the unpainted popcorn texture, and rip up the peel and stick floors to see what condition the slab is actually in.

Twin Cities we are looking at 7-10yrs before parity in housing (supply meets demand at industry accepted "normal" levels).

Perhaps lay them on the diagonal, or consider a multi-tile "pattern", real stone, or "wood plank" tiles to spice things up.

Usually the tax map will show a diagonal line splitting the land.  

On this first job I had my wife hold the tape at the base of the wall and then I measured diagonally along the wall at an angle that approximated the slope of the roof.

@Brian Stephens Here, diagonally across the continent, most buildings have basements and/or crawlspaces (often both) and the older ones are rubble walls.