Most listings are in the $20's per square foot per year. The Waterville submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $25 per sqft per year.
In the last 90 days, 7 listings have come on the market, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 14% of the available space in the Waterville 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 360 sqft. Most properties in this market are close to 2 floors. Most buildings in this region were built in 1928 and are Class Class A.