Compared to the rest of the Greater Boston market, the Somerville region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 25 listings have come on the market, which means new availabilities most likley are going fast. 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 2,400 sqft. Most properties in this market are approximately 4 stories. Most buildings in this region were built in 1989 and are Class B.