Currently, this will only work if the APs are connected via Ethernet.
What is required is as follows:-
Two separate offices connected to each via a Wireless Bridge using AP Pro’s (or any other AP). The corresponding Ethernet connection is used to connect each AP to the local LAN. The devices are connected to the local office LAN via Ethernet.
Having Office #1 on a different subnet to Office #2 will significantly reduce the amount of unneccessary traffic going over the limited bandwidth wireless bridge and enable the ability to use a firewall and prioritise traffic. i.e. at Office #2 there is IP phones which need to be prioritised over other traffic.