On average, listings lease in the $20's per square foot per year. The Concord submarket is going through a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 14% rise in rent.
Compared to the rest of the Greater Boston market, the Concord region has higher rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 120 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the office spaces in the Concord are subleases, so you will probably have to focus your search on direct office leases. 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 1,500 sqft. Most properties in this region are around 2 floors. Most buildings in this market were built in 1920 and are Class Class B.