The restrictions are spelled out in a 22-page “special warranty deed” filed in 2012 with the Philadelphia commissioner of records when the property was sold by Sunoco Inc. to Philadelphia Energy Solutions. Sunoco, which is now owned by Energy Transfer LP, retains legal responsibility for remediating contamination that occurred before 2012. The deed restrictions apparently were a means to protect its ongoing interests to remediate the property under an agreement with the Pennsylvania Department of Environmental Protection.