The typical asking rate per listing is in the $30's per square foot per year. The Bristol region is experiencing a an increase in rates. In the last 3 months, the median rate went up $34 per sqft per year.
In the last 90 days, 4 listings have come on the market, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 125% of the available space in the Bristol are subleases, so you might be able to snag a great spot on a short term. 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 750 sqft. Most properties in this region are close to 1 stories. Most buildings in this area were built in 1950.