§ 218. Mortgages. 1. Any redevelopment corporation may borrow funds and secure the repayment thereof by mortgage. Every such mortgage shall contain reasonable amortization provisions and shall be a lien upon no other real property except that forming the whole or a part of a single development area.

2. Certificates, bonds and notes, or part interests therein, or any part of an issue thereof, which are issued by a redevelopment corporation and secured by a first mortgage on the real property of the redevelopment corporation, or any part thereof, shall be securities in which all the following persons, partnerships or corporations and public bodies or public officers may legally invest the funds within their control, provided that the principal amount thereof shall not exceed the limits, if any, imposed by law for such investments by the person, partnership, corporation, public body or public officer making the same: every executor, administrator, trustee, guardian, committee, conservator or other person or corporation holding trust funds or acting in a fiduciary capacity; the state, its subdivisions, cities, all other public bodies, all public officers; persons, partnerships and corporations organized under or subject to the provisions of the banking law (including savings banks, savings and loan associations, trust companies, bankers and private banking corporations); the superintendent of financial services as conservator, liquidator or rehabilitator of any such person, partnership or corporation; persons, partnerships or corporations organized under or subject to the provisions of the insurance law; and the superintendent of financial services as conservator, liquidator or rehabilitator of any such person, partnership or corporation.

3. Any mortgage on the real property in a development area, or any part thereof, may create a first lien, or a second or other junior lien, upon such real property.

4. The limits as to principal amount secured by mortgage referred to in paragraph two of this section two hundred eighteen shall not apply to certificates, bonds and notes, or part interests therein, or any part of an issue thereof, which are secured by first mortgage on real property in a development area, or any part thereof, which the federal housing administrator has insured or has made a commitment to insure under the national housing act. Any such person, partnership, corporation, public body or public officer may receive and hold any debentures, certificates or other instruments issued or delivered by the federal housing administrator, pursuant to the national housing act, in compliance with the contract of insurance of a mortgage on real property in the development area, or any part thereof.