Therefore, the performance of the property will be determined by your management skills, not the seller'sMost leases in this type of property will come up for renewal in the next 12 months, so whatever data you would get from the seller may be entirely irrelevant in year two.The asking price for these properties are determined by comps, not by performance.  

These are prices an actual buyer has paid and if there is enough data you will see what the market currently is.

I'm not sure exactly where to look but that's what you'll want to look for.When you get an appreciation percentage per year, you can easily apply that to the purchase price of the house that fits your buying criteria and get an estimated equity gain from demand appreciation.You can also do some more in-depth research, house by house after solidfying your buying criteria for a house, then using the local MLS data to find previous sales on houses, calculate the difference in the sales prices and then "project" that appreciation number on your current deal / house that you're looking at.

Also, once buyers start using an agent they're usually getting their property feeds thru their agent's MLS system and don't look at the other sources you mentioned any longer as they realize zillow/trulia have a bunch of out dated data.

One came up a for foreclosure, 3 have no data available with some quick web searches and like an idiot, I didn't make notes on which ones were vacant and which ones were in poor condition, so I'll figure what others were vacant later with google maps. 

It's taking some time to format all the data and present it, but should  be ready in about two weeks.

The report and the data being collected are ordered very nice.

Side bonus, when I mow or do maintenance, the wireless router/modem allows me full internet access on my phone without using 4G Data to death.  

I was also able to pull an excel spreadsheet from a local website that details property/parcel data.

Hard to get reliable data from zillow,  numerous examples of houses we sold that, yellow dots show what we purchased it for, not sold, seriously messes up comps.