The Thoreau Center for Sustainability, operated by Tides
, is a model "green" center for non-profits and the first organization to locate to the Presidio after the site became part of the national park system
. The Thoreau Center, which opened its doors in 1995, rehabilitated the historic former Letterman Hospital complex
using environmentally-sustainable techniques
Today, the Center's 12 buildings house 60 organizations working for social justice, community education and development, public health, and environmental stewardship.
Visitors are invited to enter the Thoreau Center lobby to enjoy a collection of historic photos on display and to experience the campus’s bright and open feeling. The Thoreau Gallery
regularly hosts exhibits and programs for the public. Acre Café is open for visitors Monday to Friday.