Officers responded to the complex at 485 Woodside Road at 5 p.m. Monday to investigate a possible theft by an employee.
Staff members told police that the employee had been seen exiting an elderly resident's apartment and then discarding jewelry. Staff said the employee should not have been in the apartment, according to police.
Police identified the employee as food service worker Luis Cebrero, who had been employed at Woodside Terrace since April.
Detectives determined that Cebrero, who lives in unincorporated San Mateo County, had entered the apartment and stolen the jewelry.
They were also able to connect Cebrero to five prior thefts at the complex, police said. A search of Cebrero's home uncovered some of the stolen property, police said.
Cebrero was arrested for burglary and elder abuse and booked into San Mateo County Jail.