The Skylands property consists of the historic Skylands Manor mansion, and the New Jersey Botanical Garden; the botanical garden is 96 acres (390,000 m2) and it is open to the public year-round.

Lewis hired architect John Russell Pope to design the 44-room Tudor revival manor house.

The manor is a reproduction English mansion featuring rectangular, bay and oriel windows.

The Winter Garden included New Jersey's largest Jeffery pine (Pinus jeffreyi).

Other interesting non-native trees include an Algerian fir (Abies numidica) and Atlas cedar (Cedrus atlantica).