Haw. Rev. Stat. § 46-127

(a) Unless terminated pursuant to section 46-125 or unless canceled pursuant to section 46-130, a development agreement, amended development agreement, or modified development agreement once entered into, shall be enforceable by any party thereto, or their successors in interest, notwithstanding any subsequent change in any applicable law adopted by the county entering into such agreement, which alter or amend the laws, ordinances, resolutions, rules, or policies specified in this part.

(b) All laws, ordinances, resolutions, rules, and policies governing permitted uses of the land that is the subject of the development agreement, including but not limited to uses, density, design, height, size, and building specification of proposed buildings, construction standards and specifications, and water utilization requirements applicable to the development of the property subject to a development agreement, shall be those laws, ordinances, resolutions, rules, regulations, and policies made applicable and in force at the time of execution of the agreement, notwithstanding any subsequent change in any applicable law adopted by the county entering into such agreement, which alter or amend the laws, ordinances, resolutions, rules, or policies specified in this part and such subsequent change shall be void as applied to property subject to such agreement to the extent that it changes any law, ordinance, resolution, rule, or policy which any party to the agreement has agreed to maintain in force as written at the time of execution; provided that a development agreement shall not prevent a government body from requiring the principal from complying with laws, ordinances, resolutions, rules, and policies of general applicability enacted subsequent to the date of the development agreement if they could have been lawfully applied to the property which is the subject of the development agreement at the time of execution of the agreement if the government body finds it necessary to impose the requirements because a failure to do so would place the residents of the subdivision or of the immediate community, or both, in a condition perilous to the residents' health or safety, or both. [L 1985, c 48, pt of §1]