The typical asking rate per listing is in the $30's per square foot per year. The South Philadelphia East submarket is going through a a rise in rates. In the last 3 months, the median rate increased $38 per sqft per year.
Compared to the rest of the Philadelphia market, the South Philadelphia East region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 3 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the listings in the South Philadelphia East 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 spaces below 2,000 sqft. Most buildings in this area are around 28 stories. Most buildings in this market were built in 1930 and are Class B.