The provisions of this article shall not apply to any person, firm, partnership, association or corporation who, as a bona fide owner or lessor, shall perform any of the aforesaid acts with reference to property owned by him, nor shall they apply to or be construed to include attorneys at law, receivers, trustees in bankruptcy, executors, administrators or persons selling real estate under the order of any court or the terms of a deed of trust, state banks, federal banks, savings banks and trust companies located within the state, or to insurance companies incorporated under the insurance laws of this state.
N.J.S. § 45:15-4