Equity Residential has sold a 193,230-square-foot medical office building on the Massachusetts General Hospital (MGH) campus for $123.3 million.

The 10-story, class A building at 50 Staniford St. was purchased on April 22 by an affiliate of RREEF Property Trust, the Boston Business Journal reported.

Cushman & Wakefield’s President Robert Griffin and Vice Chairman Edward Maher oversaw the transaction, with a team that included Executive Director Matt Pullen and C&W’s Medical-Academic Practice Group of Executive Director Frank Nelson, Senior Director Michael Greeley and Associate Director Thomas Greeley.

50 Staniford St. is 100 percent leased to a multi-tenant roster anchored by General Hospital, Partners HealthCare’s flagship hospital, which occupies 74 percent of the building. Other tenants include Ophthalmic Consultants of Boston and Boston Eye Surgery.