Minimum Open Space. At least twenty (20%) percent of the site shall consist of open space, exclusive of buildings, parking lots, access drives and any minimum required distances between such features, and such open space shall be designated and improved for use so as to create a riverfront promenade in addition to other walkways, sitting and picnic areas, playgrounds, open lawn areas, dog parks, permitted active or passive outdoor recreational uses, and surface and rooftop gardens. Said open space may be dedicated for public use or may be retained in private ownership but at least one-half (1/2) of said open space, including the entirety of the riverfront promenade, shall be accessible for public use and enjoyment. Open space intended for public use and enjoyment shall be accessible to the public or shall be made to be accessible to the public from off-site by means of roadways, parking areas and/or walkways. The location and proposed use and ownership of all open space shall be shown on the approved site plan for the development.