(a) All real property taxes levied by the board in 1989 and 1990 are confirmed and validated, and are declared to be and are valid, in all respects as if they had been timely and properly levied by the city council upon the demand and direction of the Board. It shall not be a valid ground for any person in any way to object to, protest, bring any proceeding with regard to or defend against the collection of any such taxes, that the taxes were levied by the board.
     (b) The board may levy taxes against all taxable property located within the city in an amount equal to all taxes purported to be levied by the board in 1989 and in 1990, for each purpose for which taxes were purported so to be levied, to the extent those taxes shall not yet have been extended for collection at the time of the levy authorized by this paragraph (b). The taxes authorized to be levied by this paragraph (b) shall be levied by a resolution of the board selected pursuant to Public Act 86-1477. The resolution shall be adopted upon concurrence of a majority of the members of the board. The taxes levied pursuant to this paragraph (b) shall be extended for collection in 1991 and subsequent years and in amounts so that they do not exceed the maximum rates at which taxes may be extended for the various school purposes, all as shall be set forth in a certificate of the controller of the board as provided in Section 34-54.1 of this Code. Taxes levied pursuant to this paragraph (b) shall be in addition to all other taxes which have been or may be levied by or for the board, except that the extension of taxes levied pursuant to this paragraph (b), to the extent valid and legal in all respects, shall be an abatement of the same amount of taxes previously purported to be levied by the board which were to have been extended in the same year for the same purpose, it being the intention of the General Assembly that there not be extended duplicate taxes for the same year and purpose. It shall not be necessary that the board give any notice or conduct any hearings for any purpose whatsoever or to have adopted any proceedings with respect to any budget, in connection with the levy and extension of taxes pursuant to this paragraph (b). The board shall cause a certified copy of its resolution levying taxes pursuant to this paragraph (b) to be filed with the county clerk of each county in which any taxable property in the city is located within 30 days after the adoption of the resolution.