The typical asking rate per listing is in the $30's per square foot per year. The Harlem submarket is going through a a boost in rates. In the last 3 months, the median rate went up $12 per sqft per year. That's a 45% increase in rent.
Compared to the rest of the New York City market, the Harlem submarket has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 16 listings have come on the market, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 5,120 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this area are approximately 5 stories. Most buildings in this area were built in 1920 and are Class A.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Utilities is the dominant industry in this area. Most of the occupants of Harlem work from home. Commuting around 20 minutes a day is the norm for those who opt to reside in this part of town.