The typical asking rate per listing is in the $10's per square foot per year. The Danvers submarket is experiencing a a boost in rates. In the last 3 months, the median rate went up $20 per sqft per year.
Compared to the rest of the Greater Boston market, the Danvers region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 33 listings have been posted online, which means new availabilities 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.
The standard measurement for office space in this area is around 2,200 sqft. Most properties in this market are approximately 2 floors. Most buildings in this region were built in 1987 and are Class B.