EAGLE ROCK — Chipotle, the Mexican fast-food chain, is preparing to open a new location in an Eagle Rock shopping center. The chain has applied for building permits to remodel a space in the building that once housed a Quiznos and Cold Stone Creamery . The approximately 1,900-square-foot restaurant with 38 seats would join several other chain businesses, including a Starbucks and Jamba Juice, that already do business at the shopping center at the southwest corner of Eagle Rock and Colorado Boulevards.