Compared to the rest of the Greater Boston market, the Nashua region has less expensive rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 145 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available space in the Nashua are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 2,290 sqft. Most properties in this region are around 2 floors. Most buildings in this area were built in 1968 and are Class A.