The typical asking rate per listing is in the $10's per square foot per year. The Berks County submarket is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 4% rise in rent.
In the last 90 days, 193 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the listings in the Berks County are subleases, so you will probably have to consider a longer term lease. 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 2,700 sqft, there are still 0 leases below 2,000 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1987 and are Class B.