The district covers the "Old Downtown" area, along Magnolia Avenue from the Lark Creek Inn at 234 Magnolia Avenue to the platform on the former railway, now a bicycle path.

The avenue has been the commercial center of activity in Larkspur since the town was founded.

In 1980, the Larkspur City Council designated it to be a local historic district and rezoned it as an overlay H Zone.

[1] It was asserted that the district is significant because it still has the ambiance of a small California town in the 1900–1930 era.

This article about a property in Marin County, California on the National Register of Historic Places is a stub.