Why this is a win for Sound Transit

I want to analyze this proposal from the perspective of Sound Transit. There's a civic proposal to convert the WSCC Arch building at 7th & Pike into a year-round public commons operated by Seattle Center. The case being made to Sound Transit: A year-round activated commons two blocks from a Link station generates the kind of ridership a dark building never will. The argument isn't about a single event — it's about the network. When the Arch is a civic destination people want to visit, it becomes a reason to park and ride that has nothing to do with a specific convention or game. That's the difference between transit serving a venue and transit serving a neighborhood. The equity case is the same: a public commons accessible by rail, without a ticket required, is the highest-value civic use of transit-adjacent space in this corridor. Sound Transit has both a ridership interest and an equity mandate that align with what the Commons would do. The full proposal: https://commons.conventioncityseattle.com What are the strongest arguments for and against, from Sound Transit's perspective?