N.J. Stat. § 40:37-17
Whenever any public park has or shall have been established in any county along or contiguous in part to any line dividing the county in which the park is established from another and adjoining county, the park commission or other body in control of the park in the county in which the public park is located, may acquire, hold, develop, control, maintain and regulate in the same manner in which it is empowered to acquire, hold, develop, control, maintain and regulate lands in its own county, such adjoining lands in the adjoining county as such park commission or body shall deem necessary or proper for the proper protection or development of the park in its own county, but only after consent shall have been obtained by resolution from the governing body of the municipality, and by resolution from the board of chosen freeholders of the county, in which the lands proposed to be so acquired are situate. The municipality and the board of chosen freeholders in such other county may impose conditions under which these lands may be so acquired, held, developed, cultivated, maintained and regulated.
N.J.S. § 40:37-17