Thomas also agreed to make full restitution to all victims. Prosecutors say the estimated loss in diamonds, Rolex watches and cash is about $675,000. A restitution hearing was to be schedule later.
In exchange for the plea, prosecutors dropped five more counts of first-degree residential burglary.
Thomas, a West Hills resident, is suspected of being the ringleader of a burglary crew that hit homes in Bel Air, Beverly Hills, Holmby Hills, Encino and Sherman Oaks.
Over a four-year period, police believe the so-called "Hillside Burglars" targeted dozens of homes and stole millions of dollars in jewelry and cash.
Thomas, self-identified as an auto broker, was arrested in January 2009 when LAPD detectives matched DNA at one residential burglary to his. No other members of the crew have been arrested.
