On average, listings lease in the $10's per square foot per year. The Kennebunk submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $2 per sqft per year. That's a 15% rise in rent.
In the last 90 days, 6 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,300 sqft. Most properties in this area are around 2 floors. Most buildings in this market were built in 1890 and are Class B.