T Taman kota intan is a heritage area with significant historical and cultural value; however, it is currently experiencing degradation due to inadequate building maintenance, decliningcommunity activities, and land-use changes that are not aligned with its cultural heritage character. these conditions have led to a decrease in the vitality and identity of the area.this final project aims to design a mixed-use architectural development with a primary residential function as an effort to revitalize and optimize land use within the taman kota intanheritage area through an infill building approach. the research methods include literature review, field observation, and design analysis by applying the principles of infill building, namely sense of place, diversity, density, compatibility, and public participation, integrated with design theories proposed by kathryn h. anthony and robert g. hershberger.the design outcome indicates that the application of the infill building approach enables the harmonious integration of new functions, including residential, office, and commercial uses,without diminishing the historical value of the area. therefore, the proposed design is expected to enhance social and economic activities, support the sustainability of the heritage area, andstrengthen the identity of taman kota intan.