This article is intended to aid the state in the execution of its duties by providing appropriate and independent instrumentalities of the state with full and adequate powers to fulfill their functions. The foregoing sections of this article shall be deemed to provide additional and alternative methods for the doing of the things authorized thereby and shall be regarded as supplemental and additional to and not in derogation of any powers conferred upon corporations created by municipalities within this state or upon any other agencies of the state or the municipalities thereof which are concerned with the restoration, renovation, preservation, improvement, protection or maintenance of or interest in any public or private property that has been listed in the National Register of Historic Places.

Neither this article nor any provision contained in this article shall be construed as a restriction or limitation upon any power, right or remedy which any corporation organized under this article may have in the absence thereof, but shall be construed as cumulative and independent of any such power, right or remedy. No proceedings, notice or approval shall be required for the incorporation of such corporation or the amendment of its certificate of incorporation, the acquisition of any property or facilities, the making of any loans or the borrowing of money or assumption of obligations or the issuance of bonds or other instruments in evidence thereof or as security therefor except as prescribed in this article, any other law to the contrary notwithstanding.