Key legal question
Whether the amended project unlawfully altered the exterior appearance or constituted prohibited courtyard overbuilding.
Extracted holding
The installations were barely visible and did not change the building's appearance; the shaft under the stair did not count as prohibited courtyard overbuilding.
Extracted reasoning
The devices were sunk into the ground or hidden under an already permitted stair; the courtyard's function and perception did not change. Even if an overbuilding were assumed, a special situation justified an exception under municipal rules.