i thought the 2000' mark was where the local jurisdiction ended and the FAA's began. for ex. a proposed 2,000' building in chicago would have to seek FAA clearance in addition to the city where anything shorter would have to simply be cleared by chicago only.
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Sprawling on the fringes of the city in geometric order, an insulated border in-between the bright lights and the far, unlit unknown. (Neil Peart)
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