N.J. Stat. Ann. § 54:4-3.3b

Where real property is acquired by the State or by a State agency, or by an authority created by the State, by purchase, condemnation or otherwise, such property shall become tax exempt on January 1 of the calendar year next following the date of acquisition, provided that the tax assessor of the municipality in which such property is located is given written notice of the acquisition by certified mail on or before January 10 of said calendar year next following; provided further that if real property is acquired between January 1 and January 10 inclusive and the prescribed notice is given on or before January 10, such real property shall become tax exempt as of the date of acquisition.