We are trying to build a portfolio in western PA where we currently live. 

There is a lack of new building and with the Tesla semi-truck factory opening next year the pressure on the housing market is only going to increase.

I've started working with a builder locally on our first Development/Build Project.

Some buy and hold investors may have outdated beat up buildings that can't be sold conventionally without repair and your flipping operation with the right agent may just happen upon that deal for working with that person.

My goal in the long term is build up enough equity/extra income to retire at 50.

Is it as simple as: "most houses in the area sell/appraise for X, figure out how to build a house for X-20%" and there's your 20% immediate equity in a new build? 

But there is no visible building on Google Maps, and Xome.com states 0 square feet for the structure.Big red flag: I got it for 16%, the maximum interest rate in an interest rate bid down state.

Seeking guidance on:- Filter Criteria: Key factors for evaluating multifamily properties in Ohio?

It's even doing better than Columbus, OH, which is starting to fade.Detroit's focus on removing blighted buildings has been key to its renaissance, reducing inventory and improving neighborhoods. 

You will likely need to upgrade the water service to the building as well.