Every city, county, state is different, even when the laws are often the same. 

Welcome @Erin O'Brien the Philadelphia suburbs (Delaware, Montgomery, Bucks, and Chester counties) are some of the hottest markets right now to get into.

Some places (Cook county, Illinois, some big cities) forbid using criminal records (including felonies) over X years old, so you may not be able to deny just on a criminal record. 

Since you are in Dallas, TX you can go on the Colling County Clerks's web site and get access to all the foreclosure listings every month. 

I sold off 12 new builds I had in the best county of all of Mississippi ( which could be an oxymoron) these were best school districts etc .

Does anyone have recommendations for ADU design and construction companies in San Diego county?

It is rural, so the water would drain only onto my land.So some counties in many states regulate how you deal with draining of human used water.

I have been investing in Miami Dade County area, so i can't talk for the rest of FL that is a different beast, county by county, so I give you my point of view of Miami.The key point is which type condo are we talking about: newer >2010 condo, old condos, in key growth areas or not.Data, as always, speaks: condo sales ares slowing down, overall Miami is close to be a Buyer market overall (it is already a Buyer's market in many zip codes...), while appreciation is on average +5.5YoY.

This is wildly untrue in Allegheny County, PA, where the absolute best-built single-families went up just before the Great Depression and the shoddiest tract builds in the county went up from 1970-1990.

Personally if I don't have rental history within 3 years for a potential tenant and they say they own a property - I verify the address and name on title with the county that the property is located in (most states this info is online through the county assessor's website)