You use 'at' when you say where an occasion happens (at the café, at the film, at the theater). You use 'in' when you are pondering the actual structure (the table in the eatery, the group in the film, the room in the house)
a restaurant, is a business that plans and serves food and beverages to clients. Dinners are by and large served and eaten in the vicinity, yet numerous eateries additionally offer take-out and food conveyance administrations.
A restaurant patron is a person who is eating in the restaurant. They "patronize" the restaurant.
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Anything proper to the restaurant itself is the restaurant's, as is anything owned by the restaurant owner that is in service to the restaurant's function.
at a restaurant = in einem Restaurant
An international restaurant is a restaurant in a different country
The word meaning "a building in which people eat" is spelt restaurant.
Yama is a restaurant in Vail, Colorado. Yolo's Mexican Restaurant is a restaurant in Las Vegas.
Au restaurant
A restaurant that is in a hotel.
Mitochondria in a restaurant
restaurant
It depends on it the restaurant is in the hotel, attached to the hotel or located somewhere in their parking lot.