Present in the Tolay Lake Basin are a number of well-preserved architectural features, most notably a set of ranch buildings, many of which date from the first half of the twentieth century. Most of these structures were erected by the Cardoza family as integral elements of a working ranch. They represent an opportunity for preservation not only of an architectural style from this earlier era, but also as a complete collection of the building types involved in a broad function Sonoma County ranch, not dissimilar in function to its nineteenth-century predecessor. The county is analyzing alternative uses of some of the structures that not only offer preservation, but integration into the educational themes that are to embody the future Tolay Ranch Regional Park.