This has not been build yet, but is underway. Here's a little tidbit of info from an article:
Central Tower. This building will include the addition of approximately 320,622 square feet of space above the new Emergency/Trauma Center. A new operating suite, a day surgery unit, new critical care units, a new mother/baby unit, additional private rooms and easier access to outpatient services are all part of this next phase of Riverside's expansion.
Traffic and Parking. The construction of a new 600 space parking structure, pedestrian sidewalks and new access roads will make it easier and more convenient to come to Riverside Regional Medical Center, whether you're seeking treatment or visiting a loved one.