I found a book in UC Library Search that is located at SLF. Where is that?
There are two off-site storage facilities managed by the University of California. They are called Systemwide Library Facility (SLF). These facilities were formerly named the SRLF - Southern Regional Library Facility, and the NRLF - Northern Regional Library Facility.
The UC has a FAQ about these facilities.
UCSB students, faculty, and staff can request SLF items through UC Library Search.