The typical asking rate per listing is in the $20's per square foot per year. The Burlington submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 6% rise in rent.
In the last 90 days, 18 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 6% of the listings in the Burlington are subleases, so you will probably have to focus your search on direct office leases. 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 2,460 sqft. Most properties in this region are approximately 3 floors. Most buildings in this market were built in 1870 and are Class A.