Most listings are in the $10's per square foot per year. The Beverly submarket is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 6% decrease in rent.
Compared to the rest of the Greater Boston market, the Beverly region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 34 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About 9% of the office spaces in the Beverly 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 posted, 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 buildings in this region are approximately 4 stories. Most buildings in this region were built in 1985 and are Class A.