Where do you obtain your data for indentifying a new market?

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Hey BP!

I was recently looking at some commercial apartment buildings and a thought came up. If you are trying to break into a new market that you don't necessarily know, what Websites/data do you use to identify if a specific area to start looking for property. Let's assume this for commercial apartment buildings only (5+)

I started going on and looking at census data but don't really know how to put it all together to quantify my findings. 

Thanks in advance for your input!!