Most listings are in the $20's per square foot per year. The Doylestown submarket is seeing a decline in rates. In the last 3 months, the median rate fell $6 per sqft per year. That's a 19% decline in rent.
In the last 90 days, 11 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 1,550 sqft. Most properties in this market are around 2 floors. Most buildings in this market were built in 1900 and are Class B.