By "Emergency Toggle" I assume you mean an unplanned schedule in Attendant?
If so, create three profiles. Your main one, which does what you want and can be the target of a transfer and then two more, one for each building.
Configure the two additional profiles for the DNISs or gateway lines or whatever you need to "know" which building the call is coming in to.
In each of these profiles, create your unplanned schedule for that building and have the default schedule just transfer to the main profile.
In these extra profiles, take out all of the prompts and delays.
I haven't tested this, but it should work.
HTH