I realize there are certain characteristics to working with millennials that should be considered by professionals.

I also understand that at a basic level it's the interaction between the real estate purchase market and rental market supply and demand curves which drive attributes like price to rent ratios in a given area.My question is, how do those two related supply/demand curves interact at a fundamental level and what are the common characteristics or reasons a market maintains a good price to rent ratio?

So hopefully you have an idea of what neighborhoods fit into your ideal characteristics/goals/price point.

The type of property doesn't matter; what matters is rental income reliability.The Difference the Tenant Segment MakesTo illustrate the difference a tenant segment makes, below are the 15+ year performance characteristics for the tenant segment we target.We have delivered more than 480 investment properties, each targeting the same tenant segment.

What are the characteristics that matter most to you?

Then you can call roofing companies and ask for an estimate based on how many squares your roof is (and the characteristics).

There are a few characteristics that most of these lending scams seem to have in common.

Phoenix doesn't have the characteristics I'm looking for mainly because prices are way too high for the return and Phoenix is almost like a coastal city in terms of appreciation.  

I simply filter for recently sold in the last 6 months and look for homes with similar characteristics.

They probably just want to make sure you're not messing up the drainage characteristics of the site (i.e. diverting a bunch of runoff into your neighbors yard or the street).