On average, listings lease in the $20's per square foot per year. The Nashua submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 8% decline in rent.
Compared to the rest of the Greater Boston market, the Nashua submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 143 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available leases in the Nashua are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,100 sqft. Most properties in this area are approximately 2 stories. Most buildings in this market were built in 1967 and are Class A.