N.J. Stat. Ann. § 52:13D-15

No member of the Legislature or State officer or employee shall represent, appear for, or negotiate on behalf of, or agree to represent, appear for, or negotiate on behalf of, whether by himself or by or through any partnership, firm or corporation in which he has an interest or by any partner, officer or employee of any such partnership, firm or corporation any person or party other than the State in any negotiations for the acquisition or sale by the State or a State agency of any interest in real or tangible or intangible personal property, or in any proceedings relative to such acquisition or sale before a condemnation commission or court; provided, however, nothing contained in this section shall be deemed to prohibit any person from representing himself in negotiations or proceedings concerning his own interest in real property.