The typical asking rate per listing is in the $10's per square foot per year. The Norristown region is going through a an increase in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 2 listings have been listed, which means listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 10,900 sqft, there are still 0 leases below 2,000 sqft. Most properties in this area are close to 3 floors. Most buildings in this area were built in 1955 and are Class C.