Most listings are in the $20's per square foot per year. The Lakeville region is going through a an increase in rates. In the last 3 months, the median rate rose $6 per sqft per year. That's a 34% rise in rent.
In the last 90 days, 19 listings have been posted online, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available leases in the Lakeville are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 830 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 2004 and are Class B.