On average, listings lease in the $20's per square foot per year. The Montpelier region is experiencing a a boost in rates. In the last 3 months, the median rate increased $5 per sqft per year. That's a 22% rise in rent.
In the last 90 days, 19 listings have been posted online, which means new availabilities 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most properties in this market are close to 3 floors.