Most listings are in the $20's per square foot per year. The Westborough region is seeing a an increase in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% rise in rent.
Compared to the rest of the Greater Boston market, the Westborough region 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 listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 region were built in 1902 and are Class B.