Coe Hall, Planting Fields, Oyster Bay Coe Hall, built between 1918 - 1921, is a 65 room Tudor Revial mansion designed by architects, Walker & Gillette. The interior is that of the Elizabethan style. It was the home to William Robertson Coe, insurance magnate and his wife Mary Rogers Coe. The surrounding grounds, Planting Fields Arboretum, was landscaped by the Olmsted Brothers and comprise of 409 acres of formal gardens, woodland paths, greenhouses and extensive plant collections.