8.370.  Definitions. — As used in sections 8.370 to 8.450 the following words and phrases mean:

  (1)  "Agency", any state department or any division or branch thereof, or any bureau, board, commission, institution, officer or office of the state of Missouri;

  (2)  "Board", the state board of public buildings;

  (3)  "Instrumentalities", any elected official of the state, state office, state agency or any individual who spends more than fifty percent of his time in work for the state that receives all or any part of its funds or compensation from appropriated funds of this state;

  (4)  "Net income and revenues", at the discretion of the board, any of the following:  the income arising from the operation of a project remaining after providing for the costs of operation of the project and the costs of maintenance thereof; appropriations of the general assembly for the payment of bonds issued by the board for any project; or, in the case of energy retrofitting projects, the income arising from agreement between the board of public buildings and the department responsible for the operation of the facility;

  (5)  "Project", one or more office buildings or other structures, renovations, improvements and equipping of such buildings and structures and any other facilities for the use and occupancy of the agencies and instrumentalities of the state, including the department of corrections and human resources, the department of mental health and, at the discretion of the board, energy retrofitting projects in state-owned facilities or any eating facilities which may be rented to a desirable person, firm or corporation, upon proper bids, at the rental costs that the board determines to be reasonable and necessary under the provisions of sections 8.370 to 8.450;

  (6)  "Revenue bonds", bonds issued hereunder for the purposes herein authorized and payable, both as to principal and interest, solely and only out of net income and revenues relating to any project, and, in addition thereto, in the discretion of the board, out of the proceeds of any grant in aid of the project which may be received from any source.