On average, listings lease in the $30's per square foot per year. The Montpelier submarket is going through a a boost in rates. In the last 3 months, the median rate went up $35 per sqft per year.
In the last 90 days, 19 listings have been made available, which means office spaces might be leasing quickly. You'll want to be prepared to make an offer immediately. About 16% of the office spaces in the Montpelier are subleases, so you might be able to find a shorter term or below market rent. 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 80 sqft. Most buildings in this market are close to 3 floors. Most buildings in this region were built in 1875 and are Class B.