When included as a secondary use in the principal building and licensed by the State of Illinois under the Illinois Child Care Act of 1969 (ILCS Ch. 225, Act 10, §§ 11 et seq.) or other applicable statute. The premises on which such center is to be located shall include an outdoor play area of seventy (70) square feet for each child in the play area at any one time and such play area shall be fenced from adjoining properties. (See Section 3.02, Definitions).