3. Nothing in this constitution contained shall prevent the legislature from authorizing the loan of the money of the state to a public corporation to be organized for the purpose of making loans to nonprofit corporations or for the purpose of guaranteeing loans made by banking organizations, as that term shall be defined by the legislature, to finance the construction of new industrial or manufacturing plants, the construction of new buildings to be used for research and development, the construction of other eligible business facilities, and for the purchase of machinery and equipment related to such new industrial or manufacturing plants, research and development buildings, and other eligible business facilities in this state or the acquisition, rehabilitation or improvement of former or existing industrial or manufacturing plants, buildings to be used for research and development, other eligible business facilities, and machinery and equipment in this state, including the acquisition of real property therefore, and the use of such money by such public corporation for such purposes, to improve employment opportunities in any area of the state, provided, however, that any such plants, buildings or facilities or machinery and equipment therefore shall not be (i) primarily used in making retail sales of goods or services to customers who personally visit such facilities to obtain such goods or services or (ii) used primarily as a hotel, apartment house or other place of business which furnishes dwelling space or accommodations to either residents or transients, and provided further that any loan by such public corporation shall not exceed sixty per centum of the cost of any such project and the repayment of which shall be secured by a mortgage thereon which shall not be a junior encumbrance thereon by more than fifty per centum of such cost or by a security interest if personalty, and that the amount of any guarantee of a loan made by a banking organization shall not exceed eighty per centum of the cost of any such project.