In the event that such organization fails to maintain the open space in reasonable order and condition, the Borough may serve written notice upon such organization or upon the owners of the development, setting forth the manner in which the organization has failed to maintain the open space in reasonable condition. Such notice shall include a demand that such deficiencies of maintenance be cured within 35 days thereof and shall state the date and place of a hearing thereon, which shall be held within 15 days of the notice. At such hearing the Borough may modify the terms of the original notice as to deficiencies and may give a reasonable extension of time, not to exceed 65 days, within which they shall be cured. If the deficiencies set forth in the original notice or in the modification thereof are not cured within the specified 35 days, or any permitted extension thereof, the Borough, in order to preserve the open space and maintain the same for a period of one year, may enter upon and maintain such land.