Depok City faces massive urbanization pressures triggering space crises and demanding vertical housing solutions amidst a high demographic dependency ratio dominated by children and the elderly. In response to commercial apartment practices that neglect spatial quality for children’s growth, this article formulates a mid-rise multi-mass building configuration and spatial organization for middle-class vertical housing in the Harjamukti TOD area. The architectural design uses a structuralism paradigm with a pattern analysis strategy executed through a Three-Level Synthesis Method. The final design for the 41,554 m² site applies an inward-looking layout, acting as a protective enclosure to optimize natural surveillance. By activating the inner core as an integrated social center (PAUD, daycares, sensory playgrounds), the design successfully transforms conventional circulation into a vibrant, multi-generational, humanistic built environment. Keywords: Vertical housing, child-friendly design, pattern language, Depok City
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