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(65 ILCS 5/) Illinois Municipal Code.

65 ILCS 5/Art. 11 Div. 85

    (65 ILCS 5/Art. 11 Div. 85 heading)

65 ILCS 5/11-85-1

    (65 ILCS 5/11-85-1) (from Ch. 24, par. 11-85-1)
    Sec. 11-85-1. Municipalities lying within one or more townships, or whose boundaries are coextensive with the boundaries of a township, have the power to enter into a contract with any township within which the municipality lies, or with any township lying immediately contiguous to the municipality, and such township has the power to enter into a contract with such municipality, for the construction of any public improvement consisting of the construction of any bridge, subway, elevated way, or viaduct which may lie partly within the municipality, and partly outside the municipality and within the township, or consisting of the improvement of the roadway of any highway or street upon and along which runs the line of the corporate limits of the municipality, so that the improvement as proposed would lie partly within the municipality and partly within the township, in the manner authorized in this Division 85.
(Source: Laws 1961, p. 576.)

65 ILCS 5/11-85-2

    (65 ILCS 5/11-85-2) (from Ch. 24, par. 11-85-2)
    Sec. 11-85-2. The corporate authorities of such municipality and the commissioner of highways in and for such township, in the manner they agree upon, shall procure (1) detailed plans and specifications of the proposed improvement, (2) a detailed estimate of the cost thereof prepared by a competent engineer, showing the total estimated cost of the improvement, and (3) separate estimates from that engineer of the portions thereof within and without the municipality. As soon as the corporate authorities both of the municipality and of the township approve the plans, specifications, and estimates as a basis for the letting of a contract for the improvement, and as soon as the proportions of the cost thereof are agreed upon by the corporate authorities of the municipality and township, they may proceed jointly to let a contract therefor as provided in this section.
    This contract shall be let only upon competitive bidding, in the manner provided for the letting of contracts by municipalities for the constructing of local improvements under the provisions of Article 9, except that (1) the advertising for bids for the construction of the proposed improvement shall be authorized and made by the corporate authorities of both the municipality and the township, (2) bids for the construction shall be received by those corporate authorities jointly at the time and place agreed upon and stated in the notice for bids, and (3) no contract shall be let except by the approval of the corporate authorities of both the municipality and the township. All contracts shall be signed and executed by the officials of the municipality and of the township who may be vested generally, by law or ordinance, with the duty of the execution of contracts, for and in behalf of the respective bodies, and all bonds for the performance of a contract shall be made payable to those corporate bodies jointly.
    All consents, agreements, and approvals provided for in this Division 85 shall be by writing and when hereby required to be made or given by a municipality, shall be made or given by a resolution of the corporate authorities of the municipality.
(Source: Laws 1961, p. 576.)

65 ILCS 5/11-85-3

    (65 ILCS 5/11-85-3) (from Ch. 24, par. 11-85-3)
    Sec. 11-85-3. If a municipality desires to pay its proportion of the cost of such an improvement by a special assessment or a special tax upon the property within the municipality benefited by the improvement, either before or after the letting of the contract as provided by Section 11-85-2, it may pass an ordinance providing for the improvement and that the cost thereof shall be paid by a special tax or a special assessment, to be levied upon the municipality and upon the property within the municipality specially benefited by the improvement. The proceedings thereafter for the levy of that special assessment or special tax, and the collection thereof, shall conform to the provisions of Article 9, in so far as the provisions of Article 9 are applicable. It shall be no defense in any proceedings to levy a special assessment or a special tax hereunder that the special assessment or special tax is levied for work previously performed.
(Source: Laws 1961, p. 576.)

65 ILCS 5/11-85-4

    (65 ILCS 5/11-85-4) (from Ch. 24, par. 11-85-4)
    Sec. 11-85-4. A municipality participating in the construction of an improvement specified in this Division 85 has jurisdiction over the part thereof lying within the corporate limits of the municipality. The participating township has jurisdiction over that part of the improvement lying outside the municipality and within the township. The municipality and the township may repair, maintain, or reconstruct the portions of the improvement within their respective jurisdictions in the manner provided by law in cases of similar improvements lying wholly within their respective jurisdictions. But nothing contained in this section affects any power otherwise given by law to either the municipality or the township to expend money in the repair, maintenance, or reconstruction of the entire improvement or any part thereof.
    Although parts of the improvements are under separate jurisdictions, the municipality and the township interested may enter into contracts with each other providing for the repair, maintenance, and upkeep, including lighting, of the improvement, apportioning the cost thereof and providing the method of that repair, maintenance, and upkeep, as may be agreed upon between them.
    A township may surrender its jurisdiction over such an improvement to the municipality jointly interested, by agreement made between the corporate authorities of both the municipality and the township. The municipality thus assuming that jurisdiction thereafter shall be chargeable with the repair, maintenance, and upkeep of the part of the improvement so turned over, and may exercise its police powers thereover in like manner as if the improvement lay entirely within the municipality.
(Source: Laws 1961, p. 576.)