PHILADELPHIA, PA,  2015-9-25 — /EPR Retail News/ — PREIT (NYSE: PEI) has completed the refinancings of Willow Grove Park and Springfield Mall.  The loans total $202.5 million, at PREIT's share, and carry a weighted average interest rate of 3.97%, generating proceeds of $38.1 million and future annual interest expense savings of approximately $2.5  million on…