ValueRock Realty Partners, the California-based real estate investment firm, which owns and manages more than 600,000 square feet of retail properties across Hawaii, has purchased the Hawaii Kai Towne Center's buildings from Kamehameha Schools for an undisclosed price, the $9.2 billion trust said Wednesday. "The transition of Hawaii Kai Towne Center from a fully-owned Kamehameha Schools property to one where KS retains the land but sells its improvements strengthens our perpetual endowment in support…