Police call Amstutz's alleged acts brazen. The 24-year-old allegedly entered at least four condos at a complex in Fullerton in about a week. In one case, he stepped over a resident who was asleep on the floor.
"It's kind of scary because we thought it was safe place to live," said Nicole Colihan, a Fullerton resident.
Police say Amstutz allegedly stole a variety of items.
"Once inside removed televisions, computer games, credit cards ... He liked to go through wallets and purses, things that were readily accessible when he could," said Sergeant Mike MacDonald, Fullerton Police Department.
The suspect entered the condos in the early morning hours through unlocked windows and doors, while residents slept.
Police say the suspect returned to the complex driving the car he allegedly stole during the first burglary. Upon that return trip, police had the area under surveillance.
Police allege when they arrested the Whittier resident, they found a number of stolen items in the car.
"He also admitted to some involvement in some commercial burglaries in our city as well," said Sgt. MacDonald.
Police say they are looking into five more commercial burglaries to see if there is a connection.
Amstutz now faces a number of charges, including burglary, and auto theft.
The crimes are a strong reminder for residents to be cautious.
"We lock every door and every window now," said Colihan.