On average, listings lease in the $20's per square foot per year. The Concord region is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 12% decrease in rent.
Compared to the rest of the Greater Boston market, the Concord region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 8 listings have been posted online, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 3,000 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this area are approximately 2 stories. Most buildings in this region were built in 1910 and are Class Class B.