The Ygnacio Valley Library, also known as the Thurman G. Casey Memorial Library, opened in 1975. The site, formerly a walnut orchard, was donated in 1969 by Nellie G. Casey in honor of her husband. In 2004, the Walnut Creek Library Foundation and Contra Costa County Library remodeled the interior to make it beautiful and new again. Open 54 hours a week, thanks to funding from Walnut Creek's 2002 Measure Q, it is a popular neighborhood hangout, and is known for its cookbooks, mysteries, and a well-stocked Investment Corner, funded by the Friends of the Ygnacio Valley Library.