Most listings are in the $40's per square foot per year. The Central Brooklyn region is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 11% decline in rent.
Compared to the rest of the New York City market, the Central Brooklyn submarket has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 24 listings have been made available, 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 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 2,000 sqft. Most buildings in this market are around 2 floors. Most buildings in this market were built in 1931 and are Class A.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Agriculture is the dominant industry in this market. Most of the occupants of Central Brooklyn work from home. Commuting approximately 15 minutes a day is the norm for those who opt to reside in this part of town.