Preservationist Richard Nickel famously said, “Great architecture has only two natural enemies: water and stupid men.” But for my Interpretation of Architecture workshop this semester, we are focusing on a historic structure that has long depended on water for its — or rather, her — livelihood. The U.S. Lighthouse Tender Lilac dates to 1933 and was built to serve and maintain lighthouses, lightships, and buoys on the Delaware River. In 1939, she became a United States Coast Guard vessel, and she spent World War II as an armed member of port security. She was ultimately decommissioned in 1972, acted as a stationary training facility until 1984, and from 1985 to 1999 was a floating office on the James River in Virginia. Today, Lilac is the oldest lighthouse tender in the United States and the only steam-powered tender to survive with steam engines intact. Lilac received National Register listing in 2005 and is currently berthed at Manhattan’s Pier 25 under the care of the non-profit LILAC Preservation Project.