Challah owned by a non-Jew

Hi,

Challah must be separated from dough owned by a Jew-non-Jew partnership, so long as the Jew owns at least the minimum quantity obligated in Challah-tithing. There is no distinction between dough physically prepared by a Jew and dough physically prepared by a non-Jew; ownership is the defining factor.

(Shulchan Aruch Yoreh Deah 330:1-3)

Have a great day,
Mordechai