The typical asking rate per listing is in the $30's per square foot per year. The Somerville submarket is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 8% decline in rent.
Compared to the rest of the Greater Boston market, the Somerville region has more expensive rates, and you'll need to pay a premium to be in this hot submarket.
In the last 90 days, 34 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. 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 2,260 sqft. Most properties in this market are approximately 4 stories. Most buildings in this area were built in 1989 and are Class B.