I like to use IPhone or Android very, very nicely because I used lot of different, like, Job titles and departments and all those special fields, guess what, I filled them all with their personal data.

According to US census data, most recent vacancy rate for area (as of 2015) was about 8% and the area's vacancy rate appears to often be higher than the national rate. 

What is your data source concerning under 1000 doors investors?

Trying to get an appraiser from the area to drive out to a property (based on data from a LONG time ago) for a "competitive price" is a miserable experience!

I would take the city at their word on the water historical data.

It will vary from market to market, but most markets have a variety of public data available.

I like to be informed of the long run of the market before jumping in, and I hope to bring that philosophy into real estate.How granular can the data get, say for the metropolitan area level, for metrics such as inflation-adjusted rent (for 1 br?

They use various algorithms and public data which vary wildly.

You need data showing the difference on relatively large sample say N=10 per sf.You may make tenants happier that someone is not ripping other off.

What is the most efficient way to get this data?