I'm also considering finding a seller that would pay more than me to help my father-in-law out and perhaps get a wholesale commission that I could use on my next (ok, first) brrrr, but I'm not sure the best way to validate a fair price or know what a fair wholesale commission would be.

If you love it and are good don't let up on the gas.

If you want to quote out high efficiency boilers for six Tripple deckers for example requiring installation of separate gas, meters etc. etc. - that might be a situation where you would want to work with a contractor directly because you would have lots of different options with widely varying costs.

Squatters break into vacant homes, can present fake leases, and are a valid problem, but if you have cameras on the house, you will be able to get them out right away and you will see them going in.

It's been illuminating to see who the valid owner of each property is; there's a landlord leaderboard on the site.The direct value proposition allows lenders to track a list of clients or companies in real time.

Utilities are OFTEN overlooked so reach out to power, telecom, gas (or go all electric), water, and sewer to make sure you understand what it would take to get separately metered services from the primary house.

Travis made some really good/valid points.

Want to buy an old commercial building or gas station that had leaking PERC or leaking gas tanks? 

If it is then it is a valid comparison.If it is a 2 bed 2 bath condo, then make sure you look at those comps and not the hotel.

Obey TorahBest, Larry Cheshier That’s interesting Larry but the issue becomes interest rates to borrow the money wouldn’t make this a valid choice.