The typical asking rate per listing is in the $10's per square foot per year. The Topsham region is going through a an increase in rates. In the last 3 months, the median rate went up $16 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 2 listings have been listed, which means new listings 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.
Even though the median size is 9,600 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this area are around 1 stories. Most buildings in this region were built in 0 and are Class B.