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I think the D lot has historically been an overflow for long term and priced the same anyway? (Signs say it is employee only which I assume postdates the opening of the expanded LT garage)

But in any case when long term told me there was no room at the inn, they gave me a sheet of paper with a map showing how to get to the m̶a̶n̶g̶e̶r̶ D lot and referred to it as a voucher.