Two leading Am Law 100 firms are advising on Teavana’s $620 million all-cash sale to Starbucks, the biggest deal to date for the world’s largest coffee retailer.

Seattle-based Starbucks announced late Wednesday that it had reached to a deal to acquire Teavana, an Atlanta-based specialty tea retailer founded in 1997. The purchase is the latest in a series of acquisitions by Starbucks, which this summer spent roughly $100 million to buy San Francisco-based Bay Bread, the parent company of popular bakery chain La Boulange.