Required common open space shall be physically integrated into the design of the development as a unifying element such as a park, playground or linear greenway trail. Therefore, no single open area measuring less than 5,000 square feet in area shall count toward the open space requirement. If the open space is developed as a park or playground, it should be at the center of the development, with the front facades of buildings facing the open space. If developed as a greenway trail or natural corridor, the open space should be designed to link to other surrounding developments or to natural features such as stream corridors.