Cornerstone Apartments for rent in San Diego, CA on ForRent.com: (866) 280-7907 - Availability, pricing and special promotions subject to change daily. It's hard to imagine, but nothing's far from your door when you live at Cornerstone Lofts. You're located at the center of San Diego activity. A brief walk from the city's bustling work centers, shopping at Horton Plaza, restaurants and entertainment of the Gaslamp Quarter. The new Padres ballpark is within walking distance. Within two blocks you will find the Convention Center and the city's spectacular marina waterfront facing Coronado. Live in the heart of the action..