No, you cannot reenter.
I don't really know. They don't stamp hands or give ticket stubs. They have an awesome cafeteria inside too.
Based ob what I was told by secueity yesterday, once you leave the buildibg there is no reentry. Which makes sense because you gice them your ticket when you enter and they give you nothing in rwtuen. Plab to be there for several hours thefe is a lit to see and read.
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