It is next to impossible to provide land for a lease, and have it to come to an actual project UNLESS you have detailed RF engineering data that supports your development.  

I wouldn't say Redfin is necessarily "better" in terms of data quality.

The book "Equity Happens" even makes a case that home prices will rise in a period of rising rates, backed up by data from the early 80s.I am very concerned about the effect of rising rates, but just don't know how much effect it will have.

@J Scott @Jake Kucheck The problem is that securitizations feed on data and that is how the rating agencies and investors evaluate the product.

Sure, you can get sale price and some other info from zillow or whatever other RE websites are out there, but the mls has so much more important data, like days on market, etc.

Then I can get a local cheap sim card w/ tons of data, and still get my texts and calls.

Here is the issue with any predictive model:  its accuracy is directly correlated to the amount of historical data and how far out in the future you are trying to predict. 

I am not a multi family expert in any fashion, however I have brokered some larger deals in my day to those that are in the MF business and part of their due diligence was to spend a very good amount of time with PM's in the market place Not only to decide which one to hire but to get market data as we discussed above.

I was paying top dollar for data entry into a twin of Turbotax!

Are you giving them all your financial data or are you just chatting with them to see what kinds of loan programs they offer?