Most listings are in the $10's per square foot per year. The Longwood region is going through a decline in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 25% decline in rent.
In the last 90 days, 9 listings have come on the market, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,600 sqft. Most properties in this area are around 2 floors. Most buildings in this area were built in 1984 and are Class B.