Are you guys hiring data scientists?

I also looked at the assessor's data. 

If he does so under advice of my broker friend he can expect to sell it for 725k max (due to recent sales data).

Driven MasterCard I just got converted to general purposes for $8k that can be used anywhere MasterCard is accepted now.

Every neighborhood has a certain bandwidth and it's almost impossible to exceed the top limit.I believe the situation is similar with rentals, but it's obviousley not driven by appraisals.

We will need to see your expense data along with your current mortgage payment to provide any comments on rental property option.  

Speculating on "if the property has X, the answer will be Y" holds no value with such properties because the X is probably based on garbage data such as what it looks like or what is on the MLS.

Wondering how people are using Philly's open data policy (established 2012) to conduct research on neighborhoods, trends, etc.? 

Check the specific homes' tax payment, the neighborhood, other public records.Now, I spend time to run statistics of the MLS data to see what is a price range I can consider.

When you hear landlords talk about cost of turn over it is almost always hypothetical and driven by the fear of the unknown.