Medan has a high population density, due to the high level of urbanization of people in making a living in the center of the city, causing the need for housing is increasing to be the fulfilled. The condition is contrary to the fulfillment of vacant land that is starting to be crowded with buildings, especially in the city center, which is already filled with offices. The office workers who especially work in the city center have to take a long time to reach their place of activity. One of the

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... olutions for limited land for residential houses offered is the building towards vertical. So that the fulfillment of their place of residence and their attainment to their place of activity becomes easier. There are several types of vertical residential concepts, such as flats. However, these flats look shabby and the residents have poor social relations. Therefore, it is necessary to look for other alternative residential concepts. The introduction of the Co Living concept is one of the solutions offered in fulfilling housing by prioritizing socialization between owners as the main priority. The study aims to obtain the parameters in designing buildings with the concept of Co-Living Space. The study investigates several objects, including the community's readiness for the concept of residential CoLiving Space will be the level of community characteristics, the level of community space needs for public space and shared space. The research method is a qualitativedescriptive method with an analytical process based on field observations that goes through four stages starting with issue identification, theoretical input and literacy, distributing questionnaires, data analysis, and synthesizing planning and design concepts. The article emphasizes on how to design buildings with the concept of Co-Living Space for the community. The level of community readiness to live in residential buildings with the concept of Co-Living Space also discussed. Suggestions and input for the government in making policies related to vertical housi [...]