GGB Mechanical, electrical and plumbing — the services the kitchen lives on: electrical load, ventilation and extract, gas, water supply and drainage, with fire suppression and cold-chain power resilience alongside them in any serious kitchen. It is the least visible and least forgiving part of the build, because undersized power or extract is discovered under full load, after opening — which is why the services are designed from the cooking line and the food-safety flow, never retrofitted.
From Restaurant Kitchen MEP Requirements — the invisible half of the build — the full reading, with the method behind this answer.