You can mostly control and predict the rehab (this is where experience comes in), but there can always be unexpected things that pop up.

to me private is mom and pop or company that does not hold itself out as a lender in any manner.. 

In our company we occasionally send clients or people we work with "thnks" and they are e-gift cards to various places, often tailored to fit the season (ie, holidays) or a bundled product with a cute name ("Sweet Treat" THNKS might be a starbucks giftcard for the exact amount required to purchase a mocha and a cake pop).

@Ari Hadar I don't know if it is the same on the app, but the @ sign and wait till all the possibilities pop up.

I googled “retirement plans for General contractors”, stocks and real estate popped up.

Assuming it's composition shingles; look for rippling, nail pops and any work done around vents or valleys that could lead to leaking in the future.

This is a mom and pop run building where the owner did the management and repairs himself over the course of ownership in the last 8 years.

Make a list of mom and pops and start mailing/calling them. 

Sure you hear of one or two pops here or there, but it is tough to do. 

Out popped the house.