Most listings are in the $20's per square foot per year. The Manchester submarket is going through a an increase in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 41% rise in rent.
In the last 90 days, 0 listings have come on the market, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the listings in the Manchester are subleases, so you will probably have to focus your search on direct office leases. 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 730 sqft. Most properties in this area are approximately 2 floors.