With 300 square meters, does it include the total area of the back kitchen, or the living room area?

If it is 300 square meters of use area, including the back kitchen, the general understanding and practice is -

Back kitchen accounts for 2-4%;

Living room volume is about 1.5-2.5 square meters per guest seat;

If it is a light catering type, the back kitchen accounts for 10%; about 1 square meter per passenger seat.