In the last 90 days, 1 listings have been made available, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 300% of the available space in the Chester County are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most properties in this market are around 1 stories. Most buildings in this area were built in 1998 and are Class B.