Here are some methods I have used so far.Free Sources:- information, or free internet search like switchboard.com- pipl.com (not too bad for free - finds social networking sites too)- Courthouse records (shows previous subpoena addresses and if they have a driving offence their date of birth in my county.

Master areas and neighborhoods, "drive to the areas" with google maps, etc.

I believe my wife and I pass all the test under REPS and material participation.

In my condo deal I did not "drive up" the value of the property with forced appreciation and therefore was not able to get my money back out of the deal, even though that deal cash flows well.

One of the key features of the FHA loan was the Self-Sufficiency Test, which helped keep prices in check.

if there aren't any in your immediate area, drive until you get to one. 

Hi Haiden, are you an agent or do you still need to pass the test and qualify?  

Clearing, ordering surveys, soil tests.

Great marketing can drive bookings even if your reviews aren't perfect.5.

All which can be determined by Air Quality testing.