Getting real data on lease rates and other market terms is extremely important with these properties, because you won't get real financials most of the time.

A real estate license will save you a lot of money in the long run as you can capture the commissions on the buy and sell side in addition to providing MLS access for data you can't get elswhere. 

The property sold off market; since Zillow/RDC pulled the data from public sources they won't have photos2.

Have plumber, inspector, and contractor test all possible water sources from units above and the exterior of the building. 3.

Property is rising in value in this area due to Amazon's expanding data center a couple miles away.If you know someone in the area who might be interested in this, please let me know.Thanks

But it's always hard to tell up front, sometimes you just have to take a car for a test drive, so you know how it performs.. 

You can pay for the data on a website like CoStar but even the data there isn't as accurate as doing it yourself.  

There are two pieces of data that I don't pay any attention to from a wholesaler - their asking price and their repair estimate. 

I can only assume that they don't want to deal with the  Self Sustainability tests on 3-4 units.

Other sources to look for data are rentometer.com, craigslist etc for similar properties in the area.The second part of the question related to the risk of a tenant moving out.