According to Centro Properties Group, a 1,200 s/f Somersworth Nails recently opened at Tri-City Plaza, located on heavily trafficked West High St. (Rte. 9), only.25 mile north of the intersection of Rte. 16. Centro Properties Group is the owner of Tri-City Plaza and was represented by Tuck Davis with Centro Properties Group Centro Properties Group is the third largest owner of community and neighborhood shopping centers in the U.S.