- https://www.biggerpockets.com/files/user/CosIorg/file/asset-protection-spectrum-diagramHow a fully implemented asset protection layout might look. - https://www.biggerpockets.com/files/user/CosIorg/file/asset-protection-structuresLet me know if have questions or want to chat further - I can give you my investor perspective.ThanksCostinPS.

My target homes are single-family in the 80k-100k range with 2bd 2ba layout, ~1100 sq ft, near decent school districts.

Another concern is they didn’t pull permits to make any of the work (which I honestly feel is very minimal - paint, appliances, new kitchen layout, and the door to open between units). 

It already has a perfect layout for separate entry.

Updates should make the system more intuitive and streamlined, they went backwards on this one. 

There's not a typical ratio that I know of, but you can intuitively know what a reasonable number is given the immediate vicinity and when it's been vacant in the past.

That's your choice.Then I'd talk to a Landscape Architect and have the person come up with some curb appeal ideas, and then get bids on that.If the total cost comes in below the per door cost to move forward then it "MIGHT BE" a go.I believe looking at each unit as one job to be completed is more intuitive than looking at the whole complex as a job to be completed. 

If you live in one unit and rent out the other 2-3 units @ 2000/each, you will still have to lay out your own portion each month to cover just the mortgage. 

We are not tied down to our home and have been ready to move to a new home with a more desirous layout for our large family for a while now anyway. 

Assuming a competent attorney drafted that lease, it will lay out what the respective duties are for the landlord and the tenant.