Most listings are in the $10's per square foot per year. The Middlesex County region is seeing a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 6% increase in rent.
In the last 90 days, 27 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 4% of the available leases 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.
Even though the median size is 4,000 sqft, there are still 0 leases below 2,000 sqft. Most properties in this market are around 2 stories. Most buildings in this market were built in 1970 and are Class A.