Recreation, or open spaces, shall be provided for each mobilehome park of an area of at least 1,000 square feet, plus 150 square feet for each mobilehome space over 10. This open space may be used in more than one location, but no location shall contain less than 5,000 square feet for a five-acre site. Each recreational space shall be accessible to all of the mobilehome spaces in the park, and shall not be used for any other purpose.