Most listings are in the $10's per square foot per year. The Peabody submarket is going through a a rise in rates. In the last 3 months, the median rate increased $18 per sqft per year.
Compared to the rest of the Greater Boston market, the Peabody region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 11 listings have been posted online, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 18% of the available leases in the Peabody are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,900 sqft. Most buildings in this region are close to 2 stories. Most buildings in this region were built in 1985 and are Class B.