It's the owner. The property maintenance of the external wall has seriously affected the business of our store. How to compensate now?

Normal construction, without compensation.

If you really want to entangle this kind of thing, you can sue. According to the contract law and tort law, you can claim compensation from the property management company and all the owners of public external walls. Please check the terms of maintenance and liability for breach of contract in advance, and find the owner to join the compensation party on the principle that whoever benefits pays. As an employer, the property management company is responsible for such matters based on the contract and the danger of safeguarding the owners' rights and interests.