On average, listings lease in the $10's per square foot per year. The Middlesex County submarket is going through a decline in rates. In the last 3 months, the median rate fell $8 per sqft per year. That's a 29% decrease in rent.
In the last 90 days, 15 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 7% of the available space in the Middlesex County are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,400 sqft. Most buildings in this area are around 2 stories. Most buildings in this market were built in 1970 and are Class A.