(a) No county, city, town, township, board of education, or school district, shall incur any indebtedness or liability in any manner or for any purpose exceeding in any year the income and revenue provided for such year, without the assent of two-thirds of the voters of the public entity voting at an election to be held for that purpose, except that with respect to any such public entity which is authorized to incur indebtedness for public school purposes, any proposition for the incurrence of indebtedness in the form of general obligation bonds for the purpose of repairing, reconstructing or replacing public school buildings determined, in the manner prescribed by law, to be structurally unsafe for school use, shall be adopted upon the approval of a majority of the voters of the public entity voting on the proposition at such election; nor unless before or at the time of incurring such indebtedness provision shall be made for the collection of an annual tax sufficient to pay the interest on such indebtedness as it falls due, and to provide for a sinking fund for the payment of the principal thereof, on or before maturity, which shall not exceed forty years from the time of contracting the indebtedness.(b) Notwithstanding subdivision (a), on or after the effective date of the measure adding this subdivision, in the case of any school district, community college district, or county office of education, any proposition for the incurrence of indebtedness in the form of general obligation bonds for the construction, reconstruction, rehabilitation, or replacement of school facilities, including the furnishing and equipping of school facilities, or the acquisition or lease of real property for school facilities, shall be adopted upon the approval of 55 percent of the voters of the district or county, as appropriate, voting on the proposition at an election. This subdivision shall apply only to a proposition for the incurrence of indebtedness in the form of general obligation bonds for the purposes specified in this subdivision if the proposition meets all of the accountability requirements of paragraph (3) of subdivision (b) of Section 1 of Article XIIIA.(c) When two or more propositions for incurring any indebtedness or liability are submitted at the same election, the votes cast for and against each proposition shall be counted separately, and when two-thirds or a majority or 55 percent of the voters, as the case may be, voting on any one of those propositions, vote in favor thereof, the proposition shall be deemed adopted.Cal. Const. art. XVI § 18