SEATTLE — The first game at the Mariners’ current ballpark was played July 15, 1999, when it opened as Safeco Field. That company’s naming-rights deal expired at the end of the 2018 season, and the Mariners signed on with T-Mobile, who will pay the team $87.5 million over the next 25 years to put its signage on the ballpark ($3.5 million per year).
The ballpark is easy to get to, located south of downtown Seattle near public transit (and also walkable, I did it from my hotel which is closer to Pike Place Market).