348.65 Exemption from taxation.—The effectuation of the authorized purposes of the authority created under this part is, shall and will be in all respects for the benefit of the people of the state for the increase of their commerce, prosperity and for the improvement of their health and living conditions. Since the authority will perform essential governmental functions in effectuating such purpose, the authority shall not be required to pay any taxes or assessments of any kind or nature whatsoever upon any property acquired or used by it for such purposes or upon any revenues at any time received by it. The bonds, their transfer and the income therefrom, including any profits made on the sale thereof, shall at all times be free from taxation of any kind by the state or by any political subdivision or other taxing agency or instrumentality thereof. The exemption granted by this section shall not be applicable to any tax imposed by chapter 220 on interest, income, or profits on debt obligations owned by corporations.