A long-awaited redevelopment project known as Marlton Square in South Los Angeles is set to move forward with the sale of a large portion of the site to Kaiser Permanente. Kaiser, the nation's largest nonprofit health plan and hospital system, plans to build two medical office buildings on the northeast corner of Marlton Avenue and Santa Rosalia Drive, real estate broker Jamie Brooks of CBRE Group Inc. said. Kaiser doctors will treat patients at the new facilities. The 22-acre Marlton Square was identified by city officials two decades ago as a prime site for redevelopment, and millions of dollars in public funds were committed for improvements.