Compared to the rest of the Greater Boston market, the Westborough region has higher rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 2 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 980 sqft. Most buildings in this region were built in 1902 and are Class B.