Most listings are in the $30's per square foot per year. The South Philadelphia region is going through a a boost in rates. In the last 3 months, the median rate rose $38 per sqft per year.
Compared to the rest of the Philadelphia market, the South Philadelphia submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 7 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 57% of the office spaces in the South Philadelphia are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 3,570 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this region are around 4 stories. Most buildings in this area were built in 1930 and are Class B.