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An article in 2015 by Offbeat L.A. suggested the oldest Restaurant in Los Angeles County was "The Saugus Cafe" in Santa Clarita, established in 1905.
However, "The Lodge" or more accurately "Saddle Peak Lodge" in Calabasas could be considered older if the building or location is the focus or determination. The building is over 100 years old, it is suggested it was built in 1880. Saddle Peak Lodge was previously known as "Crater Camp Roadhouse" . until 1985 when it was renamed "Saddle Peak Lodge" Place Setting: Saddle Peak Lodge | National Trust for Historic Preservation (savingplaces.org)
While one might think "The Old Place" in Cornell (outside Agoura) was older, but the restaurant was established in 1970. Once again, it is the building which is older; built around 1915 it was a general store and post office.
BURBANK:
VAN NUYS:
GRANADA HILLS
MISSION HILLS
SHERMAN OAKS
CHATSWORTH
The Munch Box location is a historical site (#50) while students at nearby Chatsworth High School have eaten there for generations. It opened in 1957.
Further east in Pasadena is Russell's which boasts of serving breakfast for over 100 years, it was opened in 1930 by Frank Gale.
CANOGA PARK
Follow Your Heart is located in a building much older than the vegan establishment which originated in 1970.
If you are thinking about a place you used to eat but it no longer exists; check out the Valley Museum where many LARGE pieces of recognizable signage are displayed. The Museum of the San Fernando Valley (museumsanfernandovalley.blogspot.com)
If you don't know how to split a restaurant bill when a group orders unevenly (drinks, appetizers and desserts). Apps like Splitwise and Venmo—and, more recently, QR code ordering allows each diner to pay for only what they received.