Is it located in a county with easily accessible property assessment information?  

As a contractor, specializing in flips, my advice is to get a reputable contractor to assess the property for rehab costs. 

@Matt Jackson the only thing that scares some investors about condos is HOA fees and their random assessments.

In my investing area yearly real estate property taxes can range from about 1.5% to 6% per year of assessed value. 

129K mortgage 235K assessment.  

What kind of professional should we look for to hire who can assess everything: our income, rental property, etc... to help us make better decisions for the future?

Rent is due on the first and late on the second, but we also allow a five day grace period before assessing any late fees.

All,What about obtaining tax payment/assessment information on a property (no names)?

I assessed my strengths. 

It's an interactive map that you can zoom into a lot of data points.Zillow Data It's pretty unanimous that the Zestimate is useless, but Zillow has compiled extensive data sets that are actual market data.Search for the Comprehensive Annual Financial Report (CAFR) for the municipalities you are interested in.