First is the Crime rate you can get that data by going to city-data.com. 2.

If you aren't sure where to start, you should probably pass on the deal as this should be your 10th multi-family rather than your entry into the space.Remember Warren Buffett's saying on deals: Deals are like buses. 

Study interior photos if you can find them, that is the most valuable data out there.

You can use data from AirDnA.

Here is a quick map of the area:Let's get into some data, shall we?

This will help inform you of the value, but more data points always lead to more accurate data :) 

We are currently in the process of switching platforms as well because we are expanding our portfolio and will need something that is a little more streamlined and doesn't require so much manual entry.

Been checking out a number of data sources recently - some paid like neighborhoodcout and quantmaps.

@Tom Campbell I use a system called roi muse, I have put in the offer price financing terms and expenses on based on what seller has told me and other collected data.

You could always join AirDNA for market data...