Providence Cedars-Sinai Tarzana Medical Center held a “topping out” ceremony on Friday for its new patient tower, with a 22-foot steel beam signed and hoisted to sit atop the tower.The beam symbolizes the partnership between Providence and Cedars, the hospital said. The joint venture was created in March of last year to own and operate the Tarzana campus, with Providence maintaining controlling interest.Tarzana Reimagined, a $542 million construction project due to be completed in 2023, includes outpatient and ambulatory services, along with the patient tower. Cedars is footing 49 percent of the bill, “contributing proportionately to the project, to their ownership,” Dale Surowitz, former chief executive of the Tarzana hospital, said in a previous interview with the Business Journal.McCarthy Building Cos. Inc. in St. Louis is the general contractor for the project, with Los Angeles-based Perkins&Will serving as architect.Hospital leaders and community members who donated to the project were on site to sign the beam. Tarzana employees signed a magnetic strip placed on the steel, hospital staff said.“We are figuratively and literally rising to new heights together in advancing health care,” Erik Wexler, chief executive of Providence Southern California and member of the joint venture board, said in a statement. “This is a historic moment for the San Fernando Valley as we ceremoniously mark the beginning of a unique partnership that combines the expertise, talent and commitment of two extraordinary organizations.”“The new patient tower under construction will help our organizations accomplish this joint mission,” Thomas Priselac, chief executive of Cedars-Sinai, added in a statement.