The required amount of open space land reserved under a MPUD shall either be held in corporate ownership by owners of the project area, for the use of each owner who buys property within the development, or be dedicated to a management association who shall have title to the land which shall be maintained as common open space for parks, open space and related uses. The legal articles relating to the organization of the managements association is subject to review and approval by the Planning Commission and shall provide adequate provisions for the perpetual care and maintenance of all common areas. Public utility and similar easements and right-of-ways for water courses and other similar channels may be acceptable for common open space dedication if such land or right-of-way provides usable recreational space or preserves scenic or natural site elements and has been approved by the Commission. The responsibility for the maintenance of all open space shall be specified by the developer before approval of the final development plan.