On average, listings lease in the $20's per square foot per year. The North Common submarket is going through a a rise in rates. In the last 3 months, the median rate went up $21 per sqft per year.
Compared to the rest of the Greater Boston market, the North Common region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 30 listings have been listed, which means spaces 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 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 1,360 sqft. Most buildings in this market are around 5 stories. Most buildings in this market were built in 1903 and are Class C.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Utilities is the dominant industry in this area. Most of the occupants of North Common work from home. Commuting approximately an hour a day is the norm for those who opt to reside in this part of town.