Private clubhouses, grounds and appurtenances owned and maintained pursuant to articles of membership, or contract or trust agreement, or deed specifying that said clubhouse and appurtenances shall be maintained and operated as a recreational or social facility of property owners within a tract or tracts adjacent thereto, provided that said private clubhouse, grounds and appurtenances occupy at least 15,000 square feet and that Sections 9326.3, 9326.4, 9326.5, 9326.6, 9326.7 and 9326.8 of this Chapter as well as other pertinent provisions of this chapter, are observed at all times; and provided further that said private clubhouse, grounds, and appurtenances are operated at all times by a non-profit organization, that said property is not used at any time for commercial purposes, and that said property is continually maintained for the use and benefit of property owners or residents within said tract or tracts as specified in and in accordance with the conditions and limitations imposed in said articles of membership, or contract, or trust agreement, or deed controlling the same, and subject to the rules and regulations of the governing body of said private clubhouse, grounds, and appurtenances.