Is it illegal for the property to block the left and right exits of shops?

Illegal. According to the relevant information of the inquiry, it is undoubtedly illegal to hide the facade of the business privately. Legal operation is protected by law. For the losses caused, the parties have the right to claim compensation. Legal basis:

Article 3 of the Civil Code stipulates that the personal rights, property rights and other legitimate rights and interests of civil subjects are protected by law, and no organization or individual may infringe upon them.