As the OED citation demonstrates, Phillippe has the U.K. term, but it is unknown in the U.S. (at least to me).

Being a perk of his office, he had this convenient accomodation "ex officio," which is a term in current American usage.

It's a bit akward, but I can't think of anything else which works in the U.S.

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Note added at 15 hrs (2007-07-16 16:04:43 GMT) Post-grading
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Versailles is an interesting town, which I've only visited once, during a winter, so that there weren't all that many tourists. As best I can recall, there are 17th-18th c. government buildings across the street from the palace and the appartment of our "vérificateur des Bâtiments" might have been there.

Or, there is a very delightful little 17th c. "place" (near the cathedral, I believe) which might have been built to house such higher level functionaries.

In any event, something like these areas are what I had in mind when translating the vague "domaine de Versailles" by the equally vague "confines of Versailles."

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Note added at 15 hrs (2007-07-16 16:25:13 GMT) Post-grading
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Definitely not my field of expertise, but I can't recall seeing any administrative buildings on the "grounds" of the Chateau, just those buildings across the street (one of which housed the Archives in the '80s). But the gouvernment was, after all, somewhat centered at the palace, so it would be logical to have the upper level functionaries of the state somewhat nearby, if possible.

What the "domaine de Versailles" might have meant in this historical and topographical context requires a level of knowledge which is quite beyond my pay grade.