Property is not allowed to install external security nets, only internal ones. Is this legal?

The installation of anti-theft net by the property owner, whether it is flush with the wall or not, has changed the overall effect of the building facade and is prohibited by law. The specific clause is "DecreeNo. 1 10 of the Ministry of Construction" to change the facade of the building, but from your side, the ownership of the house is yours, and you can install it as you like, as long as it does not damage the load-bearing structure of the house and does not open the door or open the window, which is allowed by law.

But since we want to install anti-theft net, we must live in the community for a period of time, and we must have a good relationship with the property management office. Discuss with the property office to install an internal anti-theft net, or make an invisible screen window with anti-theft function, which is the same color as the window frame and will not change much.