[LordGrey]

Or you set up a local router with an SSID that matches one from the corporate internal network.

That actually sounds like fun. The result, I mean; not the whole setting-up-a-router bit.

[zamadatix]

You'd probably want to clone the BSSID of one of the APs, the SSID is unlikely to be used as it gives zero context to which office it's at most of the time.