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Different networks will have different vlans.

With vlans, you have two options with your tenant networks.

1. Use a neutron l3 router. Attach a port to your tenant network and set the gateway to your external network
2. Outside of openstack, assign a gateway ip address to an interface in the same vlan as the tenant network (do not use neutron l3 routers)

Option 1 is the "Openstack" way to do this.

However Option 2 is a good option if you have the proper equipment and know what you are doing. You won't be able to use "floating ips" through Openstack in that case though. You can still provide that functionality outside of Openstack on an upstream network device.