On average, listings lease in the $30's per square foot per year. The South Philadelphia submarket 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 region has higher 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 spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 57% of the available space in the South Philadelphia are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet posted, 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 availabilities below 2,000 sqft. Most properties in this area are around 4 floors. Most buildings in this area were built in 1930 and are Class B.