On average, listings lease in the $30's per square foot per year. The Northwest Philadelphia submarket is going through a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% increase in rent.
Compared to the rest of the Philadelphia market, the Northwest Philadelphia submarket has higher rates, and you'll need to pay a premium to be in this hot region.
In the last 90 days, 13 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 230 sqft. Most properties in this region are around 3 floors. Most buildings in this market were built in 1930 and are Class C.