<![CDATA[This study clarifies the legal status of the Preliminary Sale and Purchase Agreement (PPJB) within Indonesia’s land transfer framework and delineates the limits of legal protection for good-faith purchasers at the pre-levering stage. The central issue lies in the tension between PPJB’s obligational nature and the publicity principle of land registration, particularly when confronted with third parties who have lawfully acquired a Deed of Sale and Purchase (AJB) and registered their rights. Employing a normative legal method, this research applies a statute approach (UUPA, Government Regulation 24/1997 as amended by 18/2021, Condominium Law, and relevant PUPR regulations), a conceptual approach (subjective–objective good faith, pacta sunt servanda, publicity), and a case approach (judicial tendencies). The findings demonstrate that PPJB creates only a personal claim and does not transfer real rights prior to AJB execution and registration. The “good-faith purchaser” status requires measurable, documented, and provable due diligence. Priority attaches to registered rights held by good-faith third parties, rendering PPJB purchasers’ protection primarily remedial. This study proposes an operational Good-Faith Test Matrix (Minimum Due Diligence) to support objective assessment and dispute prevention.]]>
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