Most listings are in the $20's per square foot per year. The Chester County region is experiencing a a rise in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 7% rise in rent.
In the last 90 days, 83 listings have been posted online, so you'll want to check back regularly for new listings. About 1% of the office spaces in the Chester County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,160 sqft. Most properties in this market are approximately 2 stories. Most buildings in this market were built in 1986 and are Class B.