The typical asking rate per listing is in the $20's per square foot per year. The Philadelphia Metropolitan Area submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% increase in rent.
In the last 90 days, 1426 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the available leases in the Philadelphia Metropolitan Area are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 3,000 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this market are approximately 2 floors. Most buildings in this area were built in 1982 and are Class A.