No single agency in New York State deals specifically with real estate matters. You may wish to contact the Department of State's Licensing Bureau, which licenses real estate brokers and salesmen. The phone number is (518)4744429. In addition, you may wish to contact the New York State Association of Realtors at (518)4630300.
If you are interested in buying land from New York State, you should contact the Office of General Services at (518)4745987.
If you have questions about property taxes, you should contact your municipal assessor. You can find the name, address and phone number of your assessor at the link below. In addition, you can contact the Office of Real Property Services at (518)4865446 or nysorps@orps.state.ny.us.