While I understand the concept that you are describing, at the end of the day you may just be spinning your wheels on this one.

The ADA compliant ramp can only have a rise of 1 inch for each 12 inches of run. 

Most investors, particularly new investors don't understand this and believe they can hide under the cloak of secrecy for additional fees and there are slick attorneys out there lining their pockets selling the platinum level car details to the owners of 1995 honda civics with a rusted hood and 4 mismatched donut wheels.

My advice would not be try to reinvent the wheel. 

Being a 1960s era, it will have everywhere.  6 inch tile floors, hot water pipes, countertops, etc.Would check on that before diving in.

We spent about a year spinning our wheels, and then it snowballed.

So, you would need to have it set up like an ABNB, fully furnished, this does not seem viable, Why reinvent the wheel :)  Be happy with your 10% net :) 

We are working on finding the leak but in the meantime this tenant (who is needy and has been otherwise annoying) is making a big deal about these small stains that are about 4” inches diameter.

After posting a monthly market update for Milwaukee every month for the last 5 years and looking at the data every month and the dynamic that makes prices inch up month after month it is becoming more of a certainty to me than a possibility.Because the reasons don't change: we keep devaluating the paper dollar, we still have a chronic housing shortage and we are not building nearly enough to even keep up, let alone to catch up from the deficit we carry.

I hope this provides you with a bit of motivation , Good luckHey all, I see so many posts, " I am researching, " I am doing my homework" , I am trying to build my team" "Deciding on which area" So many are TRYING but never do anything, like a hamster on a wheel, A LOT of movement but staying in the same place.