Housing packages are whatever you are able to negotiate...
However, as I see you are from Atlanta, are you US citizens? And, if so, are you aware of the recent changes to the rules for housing deductions for overseas taxpayers? Depending on your situation, this could have significant impact on your US tax liability, and should be considered in your negotiation.
Also, are you aware of the difference in tax rates between Zürich and Zug? Taxes in Zug are quite a bit lower. Something to consider when choosing where to live...