Most listings are in the $10's per square foot per year. The Manchester submarket is going through a decrease in rates. In the last 3 months, the median rate fell $0 per sqft per year. That's a 2% decrease in rent.
In the last 90 days, 4 listings have been made available, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 150% of the office spaces in the Manchester are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 2,360 sqft. Most properties in this region are close to 2 stories. Most buildings in this market were built in 1930 and are Class B.