What kind of footprint would a new 'downtown' jail require? It looks like the existing jail (ignoring parking) is about the size of a typical downtown Jax block.
The entire complex is roughly 3.5 city blocks (minus the parking) which does include their offices too. I'm not very familiar with the layout of the buildings, but the parking is necessary one-way or another for any facility. Garages of course being the much more expensive route.
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I think the idea of moving the HQ to the Florida Blue building is a great idea (also because their parking garage is mostly empty & takes up huge amount of real estate in Brooklyn...). At the very least those sites will get some utilization! Obviously cost too.
I question the need for a 500-bed facility for trial & booking purposes downtown (I'm no expert on it though). Regardless, as a city we really should want the next prison to be located in an industrial area on the Northside/Westside. There are large assemblages, with good soil & in areas that lack any business beyond storage. That's going to be the cheapest route by a mile & pursuing more urban options creates the same issues the current location does today. There are several areas which lack a "living" population & make much more sense to pursue than pushing the problem 40 years down the road to another part of town.
P.S. The cost of shuttling will be made up by actually having tax revenue on our premium urban core parcels.