So they engaged me to produce results..

That's not a profit producing activity for a Broker / Property Manager as 99% are tire kickers and the ones who will buy will buy without going on a date with you. 

It's shedding material from impact of sun's rays, that's how elec is produced.

@Tim Ryan I should have said the unit is uninhabitable and by rehabbing it will produce rental income, so a years rental income/ capital invested = CoC return?

If you're looking for this service in Columbus, your investment will most likely not produce much returns if any. 

Earlier this year, we were also posted on Booking.com, and while the listing did produce several reservations, it came with a huge amount of frustration and more last-minute cancellations that we've experienced (significantly more as a %) than the other 2 booking platforms, Airbnb and VRBO.

I am also of the belief that if a property cannot produce $1500-2000+ in rent per month, you're just going to have a hard time covering capex.

Craigslist wasn't pretty, but it was easy to use, and it worked (I found lots of great tenants via Craigslist) ...unfortunately, over the years, Craigslist produced fewer and fewer tenants, and more and more spam.  :( These days, nearly all my new tenants come from Facebook Marketplace.  

.- there are ways to never pay tax on gains (1031, owe until death, etc)- cost segregation can in effect have RE acquired at no cost- sweat equity can produce additional return.  

This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.