Most listings are in the $0's per square foot per year. The Fairmount - Art Museum submarket is seeing a decline in rates. In the last 3 months, the median rate fell $28 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 7 listings have been listed, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most buildings in this market are around 12 floors. Most buildings in this region were built in 1937 and are Class A.