Open space. A minimum of 20% of the total tract shall remain as open space. This area shall be designed as uniform land areas which can be utilized as passive or active recreation and which can be utilized as a buffer to surrounding land uses. There shall also be internal open space within each component to connect various project components and to connect individual lots within each component, such as trails, greenway, sidewalks or bike paths. Open space is also subject to maintenance provisions, etc., of § 500-18, Planned neighborhoods.