都市更新事業計畫同意書補充契約之法律性質與功能──以臺北市個案為中心的實證研究

The Legal Nature and Function of Supplementary Agreements to Urban Renewal Consent Contracts－An Empirical Study Centered on Cases in Taipei

本研究以契約理論為分析視角，探討臺灣都市更新制度中都市更新事業計畫同意書與補充契約之法律性質，指出現行制度存在明顯之權利不對等與不完全契約問題，導致權利人無法有效參與契約內容之修正、利潤分配及撤銷程序。透過不完全契約理論相關交易成本理論、產權理論、委託代理理論與拍賣理論交織分析，輔以利害關係人互動模式研究，結合臺北市實務個案，包括長虹MVP案、統創翼案、龍泉段更新案等具體揭示都市更新事業計畫同意書之缺陷與契約失衡情形，依據拍賣理論分析契約不完全，藉由補充契約平衡契約控制失衡的差額，並藉此建構整合人制度藉由補充契約設計與剩餘利潤分潤拍賣機制等改革建議，提供未來都市更新制度改革與法制創新的實證參照。

This study adopts contract theory as an analytical framework to examine the legal nature and institutional function of“consent agreements”and“supplementary contracts”in Taiwan’s urban renewal system. The current institutional design reveals significant power asymmetries and incomplete contracts, which hinder stakeholders from effectively participating in the amendment, profit-sharing, and revocation procedures of urban renewal projects. By integrating insights from incomplete contract theory, transaction cost economics, property rights theory, principal-agent theory, and auction theory, the study further incorporates a stakeholder interaction perspective to analyze empirical cases in Taipei—such as the MVP Changhong Project, Tongchuang Yi Project, and Longquan Section Renewal Project. These cases highlight the structural flaws and contractual imbalance inherent in the consent agreement mechanism. The study particularly applies auction theory to examine how supplementary contracts can rebalance the allocation of control rights and address contractual incompleteness. It proposes the integration of a“project integrator”institution and the design of a surplus-profit auction mechanism through supplementary contracts to improve contractual fairness and incentive alignment. Ultimately, the findings offer concrete policy recommendations for legal and institutional reforms in Taiwan's urban renewal framework.