I have a house where the information bubble (assessment, stats, value) is a house two blocks away, even shows a street view picture.

If you are looking at Property Values, use zillow.com, that is what we use to fact check properties values. 

The area you're targeting might be too small for anyone to be able to provide any detailed insight.

And have my first RAL under construction here in DFW The value in the 3 day is def there.

It was all really quick, and the time to complete everything happened a lot faster than I expected (which was a good thing).I was worried at first that I had to use all the partners that Rent to Retirement had, but it was really easy for me to shop around for different lenders with different terms and rates, insurance providers, and property management company.

Most cost segregation study companies provide the quote for free.

Could the seller provide you with a note for the down payment and you pay him back?

You still claim the income as miscellaneous income and deduct property taxes and mortgage interest (subject to SALT and other high mortgage limitations) on your Schedule A, but that's it.2. 

($390 value)”...

I highly recommend finding a broker and have them find a policy that meets your specific requirements.