With respect to any housing project of a housing authority, the housing authority shall, after such project has become occupied, either in whole or in part, file with the proper assessing authority on or before April 1 of each year, a statement of the aggregate shelter rentals of each such project collected during the preceding calendar year; and, unless a different amount has been agreed upon between the housing authority and the city, village, incorporated town or county for which the housing authority was created, five (5) per cent of such aggregate shelter rentals shall be charged and collected as a service charge for the services and facilities to be furnished with respect to such project, in the manner provided by law for the assessment and collection of taxes, and the amount so collected shall be distributed to the several taxing bodies in such proportions that each taxing body will receive therefrom the same proportion as the tax rate of such taxing body bears to the total tax rate that would be levied against the project if it were not exempt from taxation. A city, village, incorporated town or county for which a housing authority has been created may agree with the housing authority, with respect to any housing projects, either separately or jointly or one or more of them, for the payment of a service charge in an amount greater or less than five (5) per cent of the aggregate annual shelter rentals of any project, upon the basis of shelter rentals or upon such other basis as may be agreed upon, but not exceeding the amount which would be payable in taxes thereon were the property not exempt, and, if such an agreement is made, the amount so agreed upon shall be collected and distributed in the manner above provided. If such project or projects have become occupied or if the land upon which such project or projects are to be constructed has been acquired, such agreement shall specify definitely the location of the project or projects for which the agreement is made. Shelter rental shall mean the total rentals of a housing project as such project is defined in Section 15-95 of the Property Tax Code, exclusive of any charge for utilities and special services such as heat, water, electricity and gas. The records of each housing project shall be open to inspection by the proper assessing officers.