Compared to the rest of the Greater Boston market, the Plymouth region has lower rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 13 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 15% of the office spaces in the Plymouth 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 posted, 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 market were built in 1900 and are Class A.