The House that Junior built opened its doors in July of 1999, a rare midseason debut. The Mariners 1995 playoff run saved the team from moving to warmer climes.T-Mobile’s retractable roof acts as an umbrella leaving the north and west sides of the park open. This allows fans to hear the Portland-Seattle Railroad roll by during the game. T-Mobile also offers an extensive baseball-themed art collection throughout, the highlight of which is the glass chandelier made of one thousand bats that welcomes fans entering through the home plate gate.