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The purpose of this research is to analyze various types of the additional design alternatives of apartment housing units at ground and top floors which is recently supplied by developers in Korea, and to find out their effects on residents and to suggest design enhancements. For this research, first, eleven apartment housing estates are selected through literature review and field survey, and types of design alternatives are categorized. Second, the effects of the design alternatives on the residents are analyzed based upon survey. Third, a direction of design enhancement is suggested through analyzing residents' behavior and needs.The results of this study are (1)to verify the seven types of the design alternatives. They are ⅰ)attic at top floor unit, ⅱ)rooftop terrace at top floor unit, ⅲ)living room enlarged floor height at top floor unit, ⅳ)duplex unit at top floor, ⅴ)private garden at ground floor unit, ⅵ)private accessibility at ground floor unit, ⅶ)underground storeroom at ground floor unit, (2)to analyze the effects of design alternatives on the residents, which are composed of the spacial feasibilities of ⅰ)connection to ground, ⅱ)exposition to open air, ⅲ)diversity of composing interior space, ⅳ)flexibility of various usage and ⅴ)openness of interior space, and (3)to suggest a direction of design enhancement of the alternatives at ground and top floors for higher performance.