Coworking spaces are the easiest way in. Month-to-month memberships give you a desk, meeting rooms and an address without a long commitment, and they're spread across all five boroughs.

When you're ready for your own space, a commercial broker can help you compare buildings. Tenants often don't pay the broker directly, since the landlord usually covers the commission, but confirm this up front.

Commercial leases in New York are negotiable. Rent-free months, a contribution toward fit-out and the length of the term are all on the table, especially in a softer market.

Look out for New York City's Commercial Rent Tax, which applies to some larger tenants in Manhattan south of 96th Street. Ask your broker or accountant whether it would affect you.

Think about your team's commute. Being near several subway lines can matter more to hiring than a fancier lobby.