After the merger, Lionsgate moved into the old Artisan headquarters at 2700 Colorado Ave in Santa Monica, California (Los Angeles).
If you have any old Artisan releases on dvd, it will list the 2700 Colorado Ave address on the back cover.
Artisan was gobbled up completely by Lionsgate in December 2003.
https://www.nytimes.com/2003/12/16/movies/with-acquisition-lions-gate-is-now-largest-indie.html