The home is a 2 bedroom/1bath - 816 square foot home.

With regards to the cost to step foot into this loan I’d be paying the 5,000 she has in equity plus the difference in purchase price to sale price ? 

Several years before we bought a decade old nineteen foot Airstream, parked it on a gravel driveway below our house, plopped down some red lawn chairs and put it on AirBnb.

So the value prop is to simply shot gun as many marketing peices as you can afford and then offer 10 to 30 cents on the dollar and wait for takers.. then once you close resell right away.then there are infill lots through out the US in areas that are actually seeing new builds on infill .. infill lots in areas that have zero new construction are basically worthless.. think major rust belt cities were resale values are 100 to 125 a foot or less..

One year ago I purchased my first rental, house hacking a 4000 square foot duplex.

Someone took the little basket that holds soap and shampoo and the sign on the back of the toilet and placed them waaay in the back of the bathroom cabinet.Someone removed the tiny little LED lights I have on this 8 foot tall fake ficus in the kids bunk room and put in on the deck.

I am considering a 20 foot extension to my cabin - a new master suite with bathroom and fireplace, that would take me to around 2900 feet. 

Most ADUs are ground up and are cost prohibitive. you need to contract dwelling units under 1000 sq ft at $250 per square foot to make the numbers work as a builder in columbus. the cost of an adu and rezoning I'd pass on this one.

I wouldn’t touch wholesalers or wholesale-ing with a ten-foot pole.

Intel is a great example, who is building the largest chip manufacturing plant in the US right here, and it will be a $20 billion dollar investment that brings a few new thousand jobs.https://www.dispatch.com/story/business/2022/01/21/intel-ohio-building-computer-chip-factories-licking-county-jersey-township/9173472002/ Another example of economic growth is the upcoming Ohio State University Wexner Medical Center Inpatient Hospital which is a 1.9million square foot hospital that will bring over 800 new beds and a thousand new jobs. https://abc6onyourside.com/news/local/new-osu-hospital-expected-to-transform-health-careHere are a few more recent investments https://www.10tv.com/article/money/business/hydrogen-power-company-hyperion-bringing-700-jobs-to-columbus/530-25907aab-5517-4661-a9f3-d2ed2d5be6b0 https://news.wosu.org/news/2022-02-08/rumpke-to-build-50-million-recycling-facility-in-columbus Check out The Complete Guide to the Columbus, Ohio Real Estate Market which goes through the Columbus, Ohio market in depth and will give you a better scope of where the highest levels of growth are taking place and where to look to invest.