The typical asking rate per listing is in the $10's per square foot per year. The South Portland region is experiencing a an increase in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 17 listings have been posted online, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 106% of the office spaces in the South Portland 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 posted, so finding a space for a small business might be tough.
Even though the median size is 4,000 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are close to 2 stories. Most buildings in this area were built in 1974 and are Class A.