Treaty Oak () is located on the Pell estate near the Bartow-Pell Mansion. It was said that under this oak tree, a treaty was signed between Thomas Pell and Siwanoy Chief Wampage, selling Pell all land east of the Bronx River in what was then Westchester. The Society of the Daughters of the Revolution erected a protective fence and a plaque near the tree, but it was destroyed by lightning in 1906 and toppled in a storm in March 1909. A replacement tree was planted in 1915, and the current tree at the location is an elm.