The vision and concepts of Minato Mirai 21 have been embodied through public-private collaboration in accordance with the basic agreement of 1988 among landowners and other stakeholders around the central district. Particularly, the agreement enables the landowners to take a strong initiative in formulating local rules for well-balanced development. Also, the agreement requires the obligation of all office developers to provide a certain amount of public open spaces and social activity floors in their properties. It further stipulates detailed standards and rules on building design, such as minimum site scale, height restriction, pedestrian circulations, and setbacks of exterior walls.