Most listings are in the $20's per square foot per year. The Allentown region is going through a a boost in rates. In the last 3 months, the median rate increased $4 per sqft per year. That's a 23% increase in rent.
In the last 90 days, 71 listings have been posted online, so you'll want to check back regularly for new listings. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 4,000 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are approximately 2 floors. Most buildings in this region were built in 1970 and are Class B.