SECTION XX.  Notwithstanding any general or special law to the contrary, the department of conservation and recreation shall reclaim the land being more particularly bounded and described as follows: Southerly by the northerly line of Belgrade Avenue, fifty-seven (57) feet more or less; Westerly by land of the Commonwealth of Massachusetts, known as West Roxbury Parkway, one hundred twenty (120) feet more or less; Northerly by the southerly side line of the location of the New York, New Haven and Hartford Railroad, fifty-seven (57) feet more or less; and Easterly by land now or formerly of Clay Chevrolet, Inc., one hundred twenty-three (123) feet more or less; containing six thousand nine hundred twenty-five (6925) square feet more or less pursuant to Chapter 851 of the Acts of 1977 and the plan of land file 9096-274. Upon title to said land reverting to the commonwealth the land shall forthwith be designated as open space to be used for conservation or recreational purposes subject to the department’s continued use of the land for the purpose of sloping, embanking, filling and maintaining its remaining land appurtenant to the West Roxbury Parkway.