Multi-campus is built into the foundation, not bolted on as a premium tier.
Per-campus filtering
Every list page (people, groups, events, calendar, check-in, analytics) has a campus filter at the top. Default to your campus; flip to all-campus rollup for the senior-pastor view.
Per-campus permission scoping
Staff seats can be scoped to a specific campus. The downtown campus pastor will only see downtown people, downtown events, downtown check-in. RLS enforces this — even manual filter manipulation can't bypass it.
Per-campus giving funds
Donations route to per-campus QuickBooks income accounts. Members can choose which campus their gift supports. Reports show per-campus rollup and combined-campus totals.