T-Mobile Park is a retractable roof baseball park located in Seattle, Washington, United States. Owned and operated by the Washington State Major League Baseball Stadium Public Facilities District, it is the home stadium of the Seattle Mariners of Major League Baseball (MLB) and has a seating capacity of 47,929 for baseball. It is located in Seattle's SoDo neighborhood, near the western terminus of Interstate 90. The first game at the stadium was played on July 15, 1999.