In the late 1850's a squatter named Ebenezer Wormouth moved onto part of the land granted to John Reed as the Rancho Corte Madera del Presidio by the Mexican Governor in 1834. This land was bounded by Corte Madera Creek, Buena Vista Avenue and the Boyle Park Area. The County Road, now known as East Blithedale, ran through the property. In 1881 Wormouth filed for a government homestead on 46.26 acres.
The property had long been in dispute and had been the most contested of all Mill Valley parcels in the legal battles stemming from the United States surveys of the Mexican Land Grants. After Wormouth's death, feuding relatives, anxious to convert his real estate into cash, sold it to the developers, Lyon & Hoag. In 1901 the land was subdivided as the Sunnyside Tract and lots were sold ranging in price from $300 to $750. Terms were 10% cash, balance $10 monthly.
The hillside lots on Buena Vista with views of the bay and forested lots closer to the railroad were the most expensive lots. One year after the lots went on the market, a new advertisement appeared stating that "over 100 lots sold last spring. Many handsome homes have been built."