(unless you day job is in the trades)

Yes, computer and data sifting skills do come in handy :)  I'm a database guy myself.

The whole term of wholesaling originates on the fact you don't close on a deal with your own money you just sell a contract like options trading.

I am not a mortgage person but the "bait and switch" in the business is called "re-trading a loan".My contacts get this a lot.Some company touts they can do a rate for xx with little to no down.They collect a bunch of fees and then right about when closing they say something happened and have to move to a new higher rate.Don't believe the HYPE!!

I'm not making excuses for propstream or pin... but just my personal experience is that I wouldn't expect skip tracing to really be THAT effective.What bothers me the most is all the companies that market it as "we do skip tracing, you just click here and get the number" without making it clear that it's some computer's best guess at a number based on a million social media sites combined with county records..etc.. 

Since he is selling in the US, this can be any real property in the US that going to be held for business, investment, or trade use.

They all are just computers making guesses based on other rentals in the area and adjusting for things like more square feet.

That way you get your trades down and locked in...you know the building officials and all the other details that go into building.Best Wishes and Good Luck.

(I got a certificate in HVACR before I went to computer school back in the '70s.)

I ended up in sales and the computer industry.