@Bruce LynnHi Bruce, if you have friends at Facebook, Amazon, Google, PayPal, Apple and other tech firms, it might help to check in and they will tell you how each of them are lapping up office space in NYC in an unprecedented fashion.

Episode 10 of the Young Slumlord Podcast it’s on apple, Spotify, google, YouTube etc.

I too work as a consultant (Business Pro, with Apple) and I am beginning my REI ventures this year. 

Maybe Im just lazy, but I’d rather the apple fall out of the tree than risk climbing it and falling out myself.

It’s always wise to collect data from multiple sources - just make sure your making apples to apples comparisons (bedrooms, lot size , school districts etc.)

If you get a bad apple the housing authority will make it hard for you to get them out.

You mentioned Charlotte, Orlando, and Vegas as being popular, but with these being so different FROM each other, I don't feel these are apple to apple comparisons.

I use an Android Note 4, the app certainly seems developed for Apple users.  

Not sure if they are apples to apples or not.

PSF does not do a great job of going apples to apples on houses that need completely different repair scopes.Pick up J Scott's book, or "National Repair and Remodel Estimator 2015" big book to learn what materials should be costing you.