Call it the "art" of the deal.

A sketch of the Empire State Building by President Trump -- which once sold for less than $100 -- was bought at auction by a New York real estate developer and former business partner of Trump's for $16,000.

Donald Trump's black marker drawing on paper of the Empire State Building, made in the 1990's, sold for $16,000 at Julien's Auctions in Los Angeles. Julien's Auctions/Reuters

Elie Hirschfeld, president of Hirschfeld Properties, purchased the 12-by-9-inch black marker depiction of the iconic New York City skyscraper at an auction in California and online last week.

Get Breaking News Delivered to Your Inbox

It was created by Trump for a charity auction in Florida during the time he opened his Mar-a-Lago estate as a private club in 1995.

Julien's Auctions says the piece signed by Trump went for less than $100 the first time it was sold.

In a statement Monday, Hirschfeld says he plans to hang it in his offices a couple of blocks from Trump Tower.