New York Consolidated Laws, Civil Practice Law and Rules - CVP  Rule 3110. Where the deposition is to be taken within the state

1. when the person to be examined is a party or an officer, director, member or employee of a party, within the county in which he resides or has an office for the regular transaction of business in person or where the action is pending;  or

2. when any other person to be examined is a resident, within the county in which he resides, is regularly employed or has an office for the regular transaction of business in person, or if he is not a resident, within the county in which he is served, is regularly employed or has an office for the regular transaction of business in person;  or

3. when the party to be examined is a public corporation or any officer, agent or employee thereof, within the county in which the action is pending;  the place of such examination shall be the office of any of the attorneys for such a public corporation or any officer, agent or authorized employee thereof unless the parties stipulate otherwise.

For the purpose of this rule New York city shall be considered one county.