1. If the board of public buildings enters into a project authorized by sections 8.370 to 8.450, except energy retrofitting projects, it may require any or all of the agencies or instrumentalities of the state which occupy rented or leased quarters in the city in which the project is located to occupy quarters in the project and may require each such agency to contribute from time to time from funds appropriated for its support a proportion of the rentals necessary to be received from the project under the terms of the project contract determined by the board on the basis of the ratio which the number of square feet of floor space occupied by the agency or instrumentality bears to the total number of usable square feet of space in the entire project.

2. The board of public buildings may require any or all of the agencies or instrumentalities of the state to participate in the board’s energy retrofitting projects and may require each such agency to contribute from time to time from funds appropriated for its support a proportional share of the costs of the energy retrofitting project necessary to be received under the terms of the project agreement.