Conversation so far:
What was Justin Timberlake's first business venture?
Chi.
What was "Chi" about?
Timberlake has co-owned or provided celebrity endorsement for three restaurants in the United States: "Chi" opened in West Hollywood, California in 2003.

Question: What other business ventures does he own?
Self-contained rewrite: What other business ventures does Justin Timberlake own besides Chi?