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Is it legal for the property to modify and enable ladder control without using the owner's access control system?

illegal

Whether the installation and control of elevators in residential areas are legal or not depends on the specific situation:

It is legal to install elevator ladder control in residential property with the consent of more than 2/3 residential owners and authorized by qualified elevator manufacturers.

If the elevator ladder control is installed in the residential property without the owner's consent, it is illegal, and the owner can bring a lawsuit to the relevant department to request the elevator ladder control to be removed.