Hill was not driving the newer-model Bentley when it slammed into the front of the Esprit apartments on Marquesas Way around 2 a.m. Sunday.
"We heard a loud bang and then a splash of water, it sounded like someone crashed into the pool," said neighbor Daniel Spielman.
Firefighters said no one was hurt, but they had to cut power and gas to the building as a precaution.
When California Highway Patrol officers arrived on scene, the wrecked car was unoccupied. Investigators eventually tracked down the driver, 26-year-old Michael Lacey, who they said tried to flee the scene. He was arrested on suspicion of driving while under the influence of alcohol or drugs.
Lacey and a female passenger suffered minor injuries, but they were not taken to a hospital.
Witness Kara Hatch said she saw the same Bentley speeding down the street about 60 mph earlier in the day.
"We were walking at 8 p.m. and we saw that same car coming down really fast down the road and it was enough to make me stop and say, 'Oh that car might be drunk or something,'" Hatch said.
City News Service contributed to this report.