8. What’s That On the Roof of 20 Exchange?

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20 Exchange is notable on the skyline for the out-of-place metal scaffolding on the roof. It was built to house antenna towers – but while the building at one time has dozens of clients,  today it’s down to just two – the NYPD and one private client. But it’s still pretty fun to climb. The antenna towers share the roof with cooling equipment.