According to LoopNet, the premier commercial real estate listing service, the Philly listing that consistently has the highest number of views is that for Trinity Presbyterian Church at 2857 Frankford Avenue, near East Cambria. In the last month, it has been viewed 2,279 times. (Compare that to the 10th-most-popular–23 units and a storefront in Pottstown–which has been viewed 635 times.)
The church is in very poor condition and is now zoned residential despite the fact that there is an active congregation that still gathers and has a thrift store there. The building is being sold for $120,000 as-is.
As for the other properties LoopNet users are most interested in: