N.Y. Bridges & Tunnels New York-New Jersey Law § 21
This section and the preceding sections hereof, except section eighteen, constitute an agreement between the states of New York and New Jersey supplementary to the compact between the two states dated April thirty, nineteen hundred twenty-one, and amendatory thereof, and shall be liberally construed to effectuate the purposes of said compact and of the comprehensive plan heretofore adopted by the two states, and any powers granted to the port authority by this act shall be deemed to be in aid of and supplementary to and in no case a limitation upon the powers heretofore vested in the port authority by the two said states and/or by congress, except as herein otherwise provided.
Any declarations contained in this act with respect to the governmental nature of bridges and tunnels and to the exemption of bridge and tunnel property from taxation and to the discretion of the port authority with respect to bridge and tunnel operations shall not be construed to imply that other port authority property and operations are not of a governmental nature, or that they are subject to taxation, or that the determinations of the port authority with respect thereto are not conclusive.
The powers vested in the port authority herein (including but not limited to the powers to acquire real property by condemnation and to make or effectuate additions, improvements, approaches and connections) shall be continuing powers and no exercise thereof shall be deemed to exhaust them or any of them.
N.Y. Bridges and Tunnels New York-New Jersey Law § 21