Starbucks Coffee International (SCI), a wholly-owned subsidiary of US coffeehouse behemoth Starbucks Coffee Company, has signed a joint venture agreement with Puerto Rico Coffee Partners to open a local chain of Starbucks stores. The new company, to be called Cafe del Caribe, will manage the day-to-day operations of Starbucks in Puerto Rico, and the first store is scheduled to open in San Juan by the end of the summer.