Affinity at Southridge - 55+ Community Apartments for rent in Kennewick, WA on ForRent.com: (866) 450-8973 - Availability, pricing and special promotions subject to change daily. Kennewick's Affinity at Southridge is in a brand-new category of adult living apartments that were specifically designed for active, mature adults, 55 and over, who desire to live fully independent lives. It�s made for people who want to live on their own terms and schedules�surrounded by people their own age to socialize with, or not.br br You�ll enjoy a beautiful apartment with a full-size kitchen, roomy bath�and a washer and dryer in your own home (no dragging the laundry down the hall!). Plus twice a month housekeeping service�and no long-term commitments.