The typical asking rate per listing is in the $20's per square foot per year. The Chester County region is going through a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 14% increase in rent.
In the last 90 days, 91 listings have come on the market, so you'll want to check back regularly for new listings. About 2% of the available space in the Chester County are subleases, so you will probably have to consider a longer term lease. 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 2,640 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this region were built in 1986 and are Class B.