No person, firm, or corporation engaged in selling real or personal property or of lending money on the security of real or personal property and no trustee, director, officer, agent, or other employee of any such person, firm, or corporation shall require, or attempt or purport to require, as a condition precedent, concurrent, or subsequent, to the sale or to financing the purchase of such property or to lending money upon the security of a mortgage thereon nor as a condition precedent, concurrent, or subsequent, for the renewal or extension of any such loan or mortgage or for the performance of any other act in connection therewith that the person, firm, or corporation purchasing such property, or for whom such purchase is to be financed, or to whom the money is to be loaned, or for whom such extension, renewal, or other act is to be granted or performed negotiate any policy of insurance, or renewal thereof, covering such property or covering any liability arising from the ownership, maintenance, or use thereof through a particular insurer, agent, solicitor, or broker. This section shall not prevent the exercise by any person, firm, or corporation of its right to designate reasonable and nondiscriminatory financial requirements as to insurer, the terms and provisions of the policy and the adequacy of the coverage with respect to insurance on property pledged or mortgaged to such person, firm, or corporation; provided, however, that nothing in this section shall be construed as to prohibit the right of any person, firm, or corporation from voluntarily negotiating for or soliciting the placing of such insurance.