One of Prospect Park's oldest buildings has been converted into environmentally friendly restrooms that serve as a composting station.

Alden Maddrey, of the Prospect Park Alliance, helped design the restrooms. He says the toilets use 97 percent less water than your typical toilet. The system is expected to save 250,000 gallons of water a year and eliminate waste from going into the city's sewage system.

Water from the faucets goes toward watering the plants outside. And when you flush, it'll eventually go toward fertilizing the soil.

Maddrey says he hopes the compost will one day fertilize farms in the area, in addition to all the plants and trees in Prospect Park.

Department of Sanitation Commissioner Kathryn Garcia says she's grateful for the relief to an already strained sanitation system.