On average, listings lease in the $10's per square foot per year. The Longwood submarket is going through a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 8 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 3,600 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this area were built in 1984 and are Class B.