Police say Eddie Monterroso, 23, is suspected of stealing two NBA championship rings and other items from the facility, including $20,000 in gift cards.
El Seguno police began investigating the theft Dec. 5 and arrested Monterroso outside the practice facility on Tuesday.
Authorities say they found the rings from the 2009 and 2010 seasons and other incriminating evidence at Monterroso's home in Inglewood.
Monterroso was booked on grand theft and burglary charges.
He has since pleaded not guilty.