Most listings are in the $0's per square foot per year. The Fairmount - Art Museum region is experiencing a decrease in rates. In the last 3 months, the median rate fell $28 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 7 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, 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 close to 12 floors. Most buildings in this market were built in 1937 and are Class A.