On average, listings lease in the $20's per square foot per year. The Fairmount - Art Museum region is going through a a rise in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 23% rise in rent.
Compared to the rest of the Philadelphia market, the Fairmount - Art Museum region has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 4 listings have been made available, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. 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 5,820 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are around 12 stories. Most buildings in this market were built in 1937 and are Class A.