Most listings are in the $10's per square foot per year. The South Portland region is experiencing a decrease in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 3% decline in rent.
In the last 90 days, 17 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 6% of the office spaces in the South Portland are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 2,730 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this area are close to 2 stories. Most buildings in this market were built in 1974 and are Class A.