Is it illegal for the property to occupy the owner's pool area to do office work?

This is illegal. The pool area of commercial housing is owned and used by all owners, and shall not be occupied privately.

Should be included in the pool area are:

1. Lobby, public hall, corridor, corridor, public toilet, electric (building) elevator lobby, stairwell, elevator shaft, elevator machine room, garbage chute, pipeline shaft, fire control room, water pump room, water tank room, freezing room, fire escape, power distribution room, gas pressure regulating room and satellite TV receiving room.

2. Half of the horizontal projection area of the partition wall and external wall (including gable) between the suite and the public building space.

Should not be included in the pool area are:

1. Warehouse, motor vehicle garage, non-motor vehicle garage, driveway, heating boiler room, basement as civil air defense project, and independent use space with independent use function.

2. Houses sold by self-employed units.

3. The guard room and management (including property management) room serve multiple houses.

I hope the above content can help you. If in doubt, please consult a professional lawyer.

Legal basis:

Article 271 of the Civil Code of People's Republic of China (PRC)

Owners have the ownership of exclusive parts of buildings such as houses and business buildings, and have the right to co-manage the parts other than the exclusive parts.

Article 272

Owners have the right to possess, use, profit from and dispose of the exclusive parts of their buildings. The owner's exercise of rights shall not endanger the safety of the building or damage the legitimate rights and interests of other owners.

Article 273

The owner fails to perform his obligations on the grounds that he enjoys the rights other than the exclusive part of the building, and may give up his rights when he assumes the obligations.