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Re:New York’s Wealthiest Cut Losses as Manhattan Real Estate... by teachrdan on Thursday November 29, 2018 @05:10PM (#18564605)
You're mostly right, but the construction of the Hudson Yards projects basically counts as new (buildable) land in Manhattan:

https://en.wikipedia.org/wiki/Hudson_Yards_(development)

Re:New York’s Wealthiest Cut Losses as Manhattan Real Estate... by donretag on Thursday November 29, 2018 @05:27PM (#18564727)
Battery Park City was built on landfill using material from the World Trade Center.