The Yokohama Minato Mirai 21 (MM21) is an influential organization dedicated to the development and management of the Minato Mirai 21 area, established in 1984 and evolving into its current form in 2009. With a mission to enhance the region's charm and improve the quality of urban environments, MM21 brings together land and building owners, facility managers, and various stakeholders. The organization focuses on urban development, environmental sustainability, and cultural promotions, thereby enhancing local vitality. MM21 is committed to listening to the voices of its members and workers to inform its area management efforts.

The brand encompasses a wide range of initiatives aimed at creating a safe and high-quality living environment, fostering a vibrant urban culture, and promoting the Minato Mirai 21 brand both regionally and internationally. Members of MM21 can be categorized into full members, provisional members, and supporting members, all united in their support for the organization's objectives. Through collaborative efforts, MM21 aims to transform Minato Mirai 21 into a globally recognized cultural and urban hub.