The typical asking rate per listing is in the $30's per square foot per year. The Greater Portland region is experiencing a a rise in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 10% increase in rent.
In the last 90 days, 442 listings have been listed, so you'll want to check back regularly for new listings. About 5% of the office spaces in the Greater Portland 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,060 sqft. Most properties in this market are close to 2 stories. Most buildings in this market were built in 1985 and are Class A.