A high-density compact city may not necessarily promote beneficiary community interaction. Hong Kong is in the trend of “Double Ageing” where population and building stock are ageing simultaneously at a rapid speed. The planning and design of community facilities based on population cohort demarcation is no longer suitable. Could Hong Kong as a vertical city provide space for diversified uses within a high-rise building and thus promote the making of a vibrant intergenerational community in a vertical form?