GRIST MILL - Philipsburg Grist Mill is a historic house, water mill and trading site located on US 9 in the village of Sleepy Hollow, New York. The manor dates from 1693 when Frederick Philipse of Yonkers was granted a charter for 52,000 acres along the Hudson River. By the mid 18th century, the Philipse family had one of the largest slave-holdings in the colonial north.