The 600ft part does seem to be the most misunderstood part.
I believe the "open patches" is more of an opening (600'+ x 600'+) of the 1500'+ exposure C terrain that actually would be directly adjacent to the building (in any quadrant). It could have been worded better reversed that it takes...
Sorry that I am jumping in a bit late. Obviously Florida is affected greatly because it is very flat. I heard a different interpretation from a plan reviewer in Fla.
1. Exposure C is only defined to land or a site as 1500 ft of open terrain in both directions. It then takes 600 (600 x 600...