Looking for data/article resources about West Philly for my buyer

[Jimmy O'Connor]

I have seen a TON of activity moving into West Philly around the Cedar Park leaking into Cobbs Creek showing low days on market, healthy balance between rentals and flips, and a fair spread that does not overprice like you may see in some of the hotter neighborhoods. 

I ran into an issue of some birdie whispering in my investor's ear that this area is a "dead zone" but failed to present ANY evidence to back this up. Being a former physics teacher, I like to be armed with evidence. Aside from the MLS and public records, what CREDIBLE sources do you guys use to get a pulse and accurate description on market activities in particular neighborhoods?

*note- I go on Curbed Philly Daily