[patton]

"Bitte, nehmen Sie Platz. Einen ANDEREN Platz. Auf jedem Fall, wechseln Sie dem Platz - SOFORT."

"Please, take a seat. A DIFFERENT seat. In any case, move to another seat - NOW"

[secret garden2]

Sitz = seat and platz = place, right? Maybe it's a question of dialects. My source studied it throughout college, in literature and conversation, from German Jesuits. His form may be more formal than yours. As for me, I studied French, so c'est la vie. ;)