N.Y. Comp. Codes R. & Regs. tit. 20, § 295.3
(a) Resident individual (Administrative Code of the City of New York, § 11-1901[h]).
Whether an individual is a resident of the City of New York shall be determined using the same rules and definitions that apply in determining whether an individual is a resident of the State of New York. (See section 105.20 of this Title.)
(b) Resident estate or trust (Administrative Code of the City of New York, § 11-1901[j]).
Whether an estate or trust is a resident of the City of New York shall be determined using the same rules and definitions that apply in determining whether an estate or trust is a resident of the State of New York. (See section 105.23 of this Title.)