Cell phone towers/antennae

Does anyone know if the City has by-laws about where cell phone antennae can go? (I think there are rules about new free-standing towers, I'm really asking about antennae 'bolted onto " an existing building.) Can antennae just be put onto a building with no permit? Do cell phone companies share these antennae or must each new company go out and erect their own?

It would also be interesting to know how much rent is paid to the building owner - though clearly this would depend on location and 'field of view".











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