Some years ago, there was a study that determined opening another Starbucks across the street from an existing Starbucks would bring new business without decreasing traffic at the first shop. Don’t know if that still holds true.
Wife was transferred to Reno for three years, we lived downtown and everything was in walking distance. The Starbucks by us closed down without notice. After a couple weeks went by there was groundbreaking for a new, bigger Starbucks. Right across I-80 there was another crazy busy Starbucks, the two stores were right off the exits opposite each other.