On average, listings lease in the $20's per square foot per year. The North Philadelphia East submarket is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 2% rise in rent.
Compared to the rest of the Philadelphia market, the North Philadelphia East region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been listed, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 200% of the available space in the North Philadelphia East are subleases, so you might be able to find a shorter term or below market rent. 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 2,000 sqft. Most properties in this area are approximately 7 floors. Most buildings in this region were built in 1971 and are Class B.