The typical asking rate per listing is in the $20's per square foot per year. The Greater Boston submarket is going through a an increase in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% increase in rent.
In the last 90 days, 3593 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the listings in the Greater Boston 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 2,090 sqft. Most buildings in this region are close to 2 floors. Most buildings in this region were built in 1969 and are Class A.