Most listings are in the $0's per square foot per year. The Somerville submarket is going through a decline in rates. In the last 3 months, the median rate decreased $33 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 3 listings have been posted online, which means office spaces 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 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 1,180 sqft. Most buildings in this region are approximately 4 stories. Most buildings in this market were built in 1989 and are Class B.