When the intensity of use of any premises is increased through addition of twenty five percent (25%) or more of the floor area or developed lot area, that portion of the premises shall provide the required landscaping in accordance with the provisions of this title. When the intensity of use is increased sixty percent (60%) or more, landscaping as required by this title shall be provided on the entire developed portion of the property. (Ord. 1000 § 43.40, 1955)