Quote:
Originally Posted by ethereal_reality
OK, you might have guessed that I know NOTHING about radio towers...but
if the towers are intended to be functional wouldn't a much shorter tower on the roof the tall building work  better.
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I don't really know, either, but there may be rules that can be circumvented by using the existing towers - restrictions of one kind or another that might make towers on the building costly or otherwise problematic, but that do not apply to existing structures.
I know in some places there are rules such as this for billboards or signs. For instance, in Ukiah, CA when In-N-Out built a new location, they repurposed the existing tall sign from the business that once stood there, because a new sign would not be allowed to stand as tall. The entire rest of the property was cleared for new construction.
Several years ago the Tropicana Hotel & casino here in Las Vegas completely remodeled their large signs on Tropicana Ave. and Las Vegas Blvd., and I think there might have been similar rules, or perhaps just costs. As I drove to work each day I watched, over a period of weeks, as they systematically de-constructed the signs down to only two large metal poles, and then built entirely new signs upon those.