The typical asking rate per listing is in the $10's per square foot per year. The Chester submarket is experiencing a an increase in rates. In the last 3 months, the median rate rose $18 per sqft per year.
In the last 90 days, 1 listings have been listed, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. 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 1,880 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 2004 and are Class B.