The plane struck a parked vehicle, but the occupant was inside a store and was not injured, according to the Orange County Fire Authority.
The twin-engine aircraft was heading for John Wayne Airport when it crashed into a parked red card, a mile away from the airport on Sunday.
Lara Shephard, Floria Hakimi and Nasim Ghanadan all worked for Union Pacific Real Estate in the Bay Area. He said it appeared that the plane "went down pretty abruptly", and added that while the plane leaked jet fuel, it didn't ignite.
A twin-engine Cessna bound for John Wayne Airport in Orange County, California, crashed into the parking lot of a Staples office supply store on Sunday, killing all five people aboard, Orange County fire officials said.
Another was 29-year-old Nasim Ghanadan, who saw Hakimi as a mentor in the real estate industry, Ghanadan's brother said.
Friends and associates said all five were employees of Pacific Union International.
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The Shepherds, of Diablo, California, have two children, ages 5 and 7, according to Pacific Union.
The plane is registered to Category III, according to an FAA database.
No one on the ground was hurt and there were no other passengers in the plane.
The fire department is on scene. We looked up and we just saw a plane fall.
The plane crashed just a block away from South Coast Plaza, a large mall.
The Federal Aviation Administration and the National Transportation Safety Board are investigating the crash.