The typical asking rate per listing is in the $20's per square foot per year. The Bath region is going through a an increase in rates. In the last 3 months, the median rate went up $29 per sqft per year.
In the last 90 days, 2 listings have come on the market, which means office spaces are probably leasing quickly. 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 1,200 sqft. Most buildings in this region are approximately 2 floors. Most buildings in this area were built in 1974 and are Class A.