Contemporary buildings in Jerusalem for Haredim are built in such a manner, that the balcony of the first floor extends to, say, 20 feet, 2nd floor 17 feet, 3rd floor 14 etc, so each one has 3 feet of the skyline above the balcony to accommodate for a Kosher Succah.
A neighbor on a higher floor wants to hang an air conditioner behind his wall right above the "Sucah space" of the floor beneath.
Can he do it? And who owns the air above that "Sucah space" part of the balcony?