On average, listings lease in the $20's per square foot per year. The West Philadelphia submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 16% increase in rent.
Compared to the rest of the Philadelphia market, the West Philadelphia region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 22 listings have been made available, which means new listings might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 5% of the office spaces in the West Philadelphia 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,830 sqft. Most properties in this market are approximately 3 stories. Most buildings in this region were built in 1975 and are Class B.