The typical asking rate per listing is in the $20's per square foot per year. The Longfellow submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $26 per sqft per year.
In the last 90 days, 8 listings have been listed, which means leases might be going fast. You'll want to be prepared to make an offer immediately. About 13% of the available leases in the Longfellow are subleases, so you might be able to snag a great spot on a short term. 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 1,340 sqft. Most buildings in this market were built in 1974.