The typical asking rate per listing is in the $30's per square foot per year. The Glastonbury Center submarket is going through a an increase in rates. In the last 3 months, the median rate went up $34 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 6 listings have been listed, which means listings 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,400 sqft. Most properties in this area are around 3 floors. Most buildings in this area were built in 1987 and are Class A.