Most listings are in the $10's per square foot per year. The Maine region is going through a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 150 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the available leases in the Maine are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, 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 close to 2 floors. Most buildings in this area were built in 1900 and are Class Class B.