Spirit Rock is not a New Age Center, per se. Located in San Francisco's Bay Area (Marin County's Woodacre), Spirit Rock is home to Buddhists. They are not Zen Buddhists, as they emphasized. They are Theravada, as is one of their founding members the teacher and popular writer Jack Kornfield.
Where it is located, Marin County, many find Spirit Rock a refreshing and spiritual place to visit and take for a retreat. Marin County, and in specific Southern Marin, is not a place for Christian worship. So says a study on religious practice in Marin. One anecdotal piece of evidence indicates religious interest in San Francisco's Bay Area Marin County. One librarian at the Tiburon library says most spiritual and religious books in their library are New Age. Christian reading isn't of interest. Jack Kornfield, the Buddhist teacher, is a popular writer and many read his books here in San Francisco Bay Area and the United States.