Modern Apartments in Riverside Now offering $1,000 off move-in special on 1st month's rent! Select units only. Call the Leasing Office to learn more. Kick back, relax and enjoy the good life at Casa Sierra. Our 1 2 bedroom apartments in Riverside, California, come in a variety of floor plans so you can choose your ideal living space. Our convenient location in La Sierra places you moments away from popular dining, shopping, and outdoor recreation. The home you've been searching for is waiting for you at Casa Sierra.