purchased a New York park for $2 million, then donated it to the state claiming a valuation of $100 million for a tax write off?

The 436 acres were purchased in 1998 for $2 million with the intention of making a private golf course. He donated the land to the state in 2006 when he claimed its value to be $100 million.

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Entrance sign to New York’s Donald J. Trump State Park. Wikipedia

Outside – A Brief History of Donald J. Trump State Park
Wikipedia – Donald J. Trump State Park