Most listings are in the $20's per square foot per year. The Westborough region is experiencing a a boost in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 3% increase in rent.
Compared to the rest of the Greater Boston market, the Westborough submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 2 listings have been made available, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 980 sqft. Most buildings in this market were built in 1902 and are Class B.