(a) The proceeds derived from the sale of any bonds sold by the authority, other than refunding bonds, shall be used only to pay the cost of acquiring, constructing, improving, enlarging and equipping one or more projects, as may be provided in the proceedings in which the bonds are authorized to be issued. Such cost shall be deemed to include the following:

(1) The cost of any land forming a part of such project or projects;

(2) The cost of the labor, materials and supplies used in any such construction, improvement or enlargement, including architect's and engineer's fees and the cost of preparing contract documents and advertising for bids;

(3) The purchase price of, and the cost of, installing equipment for such project or projects;

(4) The cost of landscaping the lands forming a part of such project or projects and of constructing and installing roads, sidewalks, curbs, gutters, utilities and parking places in connection therewith;

(5) Legal, fiscal and recording fees and expenses incurred in connection with the authorization, sale and issuance of the bonds issued in connection with such project or projects; the cost of any feasibility studies deemed necessary or advisable in connection with the issuance and sale of such bonds; the amount of any debt service reserve that the board deems necessary or advisable to be funded out of the proceeds from the sale of such bonds; and

(6) Interest on the bonds for a reasonable period prior to the commencement of the construction and equipment of such project or projects, or of any improvements or additions being financed (in whole or in part) out of the proceeds from the sale of such bonds, and during the period that is estimated will be required for such construction and equipment and for a period of not more than two years after the completion of such construction and equipment.

(b) If any proceeds derived from the sale of the bonds remain undisbursed after completion of the work and payment of all costs and expenses in connection with the project or projects with respect to which the bonds are issued, such balance shall be applied toward the retirement of the bonds. The proceeds derived from the sale of any refunding bonds shall be used only for the purposes for which the refunding bonds were authorized to be issued.