Hawaii constitution
Article XVIII
Section 6

Real property tax exemptions and dedications of land for specific use for assessment at its value in such use as provided by law and in effect upon ratification of the amendment to Section 3 of Article VIII [November 7, 1978] shall be enacted by ordinance and shall not be eliminated or diminished for a period of eleven years following such ratification; provided that increases in such exemptions, or the additions of new and further exemptions or dedications of lands, may be established or granted only by agreement of a majority of the political subdivisions, and such increases or additions shall be enacted by ordinance in each political subdivision.