Most listings are in the $20's per square foot per year. The Hampden County submarket is going through a a rise in rates. In the last 3 months, the median rate went up $5 per sqft per year. That's a 24% increase in rent.
In the last 90 days, 37 listings have been made available, which means new listings most likley are 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 910 sqft. Most buildings in this area are close to 1 floors. Most buildings in this region were built in 1905 and are Class B.