I've set up similar for a client. In their case, they have wired clients hanging off an L3 switch as well as an AP.
Here, vlan1 gets cut off as soon as it hits the L3 switch on the far side. Far side uses vlan 15. There's one SSID shared between the two buildings, and I've got it set to L3 Roaming right now. It could be bridged but this client had reasons.
I need an L3 switch or a router on a stick so that I can a) remote manage my switch, and b) have both APs and wired clients on the far side.
Everything on the far side is on vlan15, with a dhcp helper setup to point DORA to her own pool on my AD DHCP server.