Most listings are in the $0's per square foot per year. The Topsham region is going through a decline in rates. In the last 3 months, the median rate decreased $16 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 0 listings have been posted online, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the available space in the Topsham 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 sqft. Most properties in this region are around 1 floors. Most buildings in this market were built in 0 and are Class B.