Code for Fire Protection Design of Buildings 5.3.2 The number of safety exits should be calculated and determined for each fire zone and each floor in the fire zone of public buildings, and should not be less than 2. When one of the following conditions is met, safety exits or evacuation stairs can be set: 1 single-story public building with a construction area of 200m2 and no more than 50 people, except for nurseries and kindergartens.

You are already a multi-storey building with many people. You must set at least two exits and evacuation passages connected with them.