N.Y.C. Admin. Code § 27-948: § 27-948 Installation of private fire hydrants.

(a) When buildings are not required to be provided with a standpipe system, at least one entrance to the building shall be located within two hundred fifty feet of a street hydrant; or, a private hydrant of the same type as the city hydrant connected to the street water main shall be provided within two hundred fifty feet of entrance. The private hydrant shall be supplied by at least an eight inch pipe, and the domestic water supply may be connected to this private supply provided a shutoff valve is installed in a curb box in the domestic supply within six feet of the hydrant shutoff valve.