Tides‘ Thoreau Center for Sustainability are green nonprofit centers house more than 70 That nonprofit organisms in San Francisco and New York City .  Thoreau Centers for Sustainability are operated by Tides Shared Spaces, a Tides initiative. 
In 1994, the Thoreau Center for Sustainability was proposed to the Presidio Trust in San Francisco , California and opened in 1996. It is an adaptive reuse of the Letterman Army Hospital .
In 2006, Thoreau Center for Sustainability opened in Lower Manhattan, New York.
- ^ Jump up to:a b Said, Carolyn (September 21, 2008). „Thoreau Center in Presidio nurtures nonprofits“ . San Francisco Chronicle . Retrieved 2009-08-11 .