On average, listings lease in the $10's per square foot per year. The Cambridge submarket is going through a an increase in rates. In the last 3 months, the median rate went up $17 per sqft per year.
In the last 90 days, 5 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,500 sqft. Most properties in this region are around 1 floors. Most buildings in this market were built in 2004 and are Class C.