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PHILADELPHIA — Liberty Property Trust and Synterra Partners have broken ground for the construction of the new Navy Yard Commerce Center. The first phase of construction will include two flex buildings totaling 103,137 square feet that will be located at 4000 and 4050 S. 26th St. The buildings have been designed to achieve LEED certification. The Fretz Corporation has already signed a lease for 22,391 square feet of space at 4050 South 26th Street. At full build-out, Navy Yard Commerce Center will contain four single-story flex buildings.