This one is not exactly on Franklin Square Drive, but it is in the Franklin Square Professional Center, so it is third in the series. Muggles will be very rare during non-business hours, but since this center is for medical professionals it might get busy during the workday. Stealth is recommended. Container is not magnetic, so replace carefully.
While you are in the area, why not grab my nearby puzzle cache, Nottingham Field. A challenging puzzle, but worth the effort.
Congratulations to All Is Vanity, GnomeGCer, JL826 and Fyregypsy for FTF.
YCP.