A real estate development firm whose major partners include five prominent local families donated 15 acres of undeveloped land valued at $8.17 million to UC Davis Health System, the single largest private donation in the health system's history.

The gift is from River South Holdings, LLC, whose partners include five local landowners: Mark Friedman of Fulcrum Properties; Martin Harmon of Western Care Construction; the Tsakopoulos family, represented by Kyriakos Tsakopoulos of AKT Development; Brian Vail of River West Investments; and John Sinadinos, an attorney and developer.

Health system officials plan to use the property, at the northeast corner of Whitney Boulevard and Highway 65 in Rocklin, to develop a health campus offering a range of outpatient services, including cancer care. The health system has submitted plans to the City of Rocklin for a new outpatient facility on a site adjacent to the gift parcel. That facility, to be completed by the end of next year, will include comprehensive imaging services and an infusion center for cancer patients.