On average, listings lease in the $20's per square foot per year. The West Philadelphia region is going through a decline in rates. In the last 3 months, the median rate fell $10 per sqft per year. That's a 33% decrease in rent.
Compared to the rest of the Philadelphia market, the West Philadelphia submarket has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 22 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 6,070 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are close to 4 stories. Most buildings in this market were built in 1975 and are Class B.