It was built in the 1980's as a separate mall, but now it's connected to the main mall via skybridge (as seen above). It is officially part of South Coast Plaza now and is where all the home goods and furniture stores are, plus some stuff like luggage stores or linen stores, and a few specialty boutiques.
I used to go there more than the main South Coast Plaza. Especially on a Monday afternoon after I, or a party guest, had broken a wine glass or something at a party that past weekend. My guests and I aren't clumsy drunks, just animated.
The Crate&Barrel there is one of the biggest/best, and the WilliamsSonoma and Pottery Barn are also large and well stocked.
My favorite was the Restoration Hardware, which is big and very luxe at that location. I used to go in there not for the actual merchandise, but just to pick up the vibe from the sales ladies who all pretended as if they were only working there for a fun hobby and they could totally afford the $80 drawer pulls and the $7,500 sofas and the $1,200 towel bars they were selling. A visit to the Crystal Court Restoration Hardware was a laugh riot of Orange County perfection!