group houses can be considered according to the building regulations, which should be 5111m2.

Look at the explanation part of the specification, which is very detailed. I will type it out for your reference.

The podium building connected with the high-rise building is low in height, and it can be evacuated quickly in case of fire, and it is also less difficult to put out the fire, so it is easy to control the fire spread. When the high-rise main building is separated from the podium by fire-proof separation facilities such as firewall, the maximum allowable building area of the podium can be implemented according to the provisions of the Building Regulations.

article 5.1.1 of the building code stipulates that the maximum allowable building area of the fire zone of a first-class building or a second-class building is 2511m2. When an automatic fire extinguishing system is installed in the building, the maximum allowable building area of the fire zone can be increased by 1.1 times as specified in this table. For local setting, the increased area can be calculated as 1.1 times of the local area.