Anybody who immediately dismisses anything other than cash flow as "speculation" is probably thinking within the narrow confines of their own definitions of investment and speculation.  

You could probably narrow the wiring based on some of the electrical components, depending on manufacturer, models, etc, but again, not sure how much it'll help.

We have narrowed down the areas we would like for buy and hold and need someone who knows the market well and can send us deals in the area (Multi family properties and SFR's).

After the first step of figuring out what direction you want to take, you'll quickly narrow down more specifics and can start adding in things like price ranges, profit margins, etc.

@Michael Johnson You're definitely going to narrow your group of potential buyers at resale.  

This can help you narrow down to software that fit your needs.Good luck!

The lot dimensions are 241x65; but we have an alley that runs along the back of the lot so if the 65 is too narrow (and we couldn't get a variance) maybe we could split it in 2 squares instead of 2 rectangles. 

If you're looking to "narrow it down", rather than just knocking randomly, consider that most counties you can freely obtain probate, eviction, and tax delinquent records.  

Thanks for the feedback @Mary B. and encouragement @Benjamin Gobel. 

You did your homework and came up with options, now narrow it down to 3 to 5 based on what appeals to your own strengths and weaknesses.