UPDATE: Blaine spotted a post that provides more background on the Joe Donham and a pic of how it looked as of 2006.
http://berkeleyheritage.com/eastbay_then-now/roadside.html
According to the website post,
Joseph B. Donham (1895–1982), who followed Warren at this location, was general sales manager for the Val Strough organization in the 1930s before striking out on his own. After running a used car dealership in Oakland, he opened an authorized Willys dealership at 2747 San Pablo Avenue, being the first tenant to lease the new showroom. Donham’s Willys dealership operated here from 1953 through 1956. After the car maker ceased production, Donham switched to selling used cars at this location and ran the Dalton & Norton Chrysler dealership in San Leandro. According to his son, Joseph Donham, Jr., Donham owned several East Bay used car dealerships while working as general manager of S&C Ford in San Francisco.
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Originally published in Feb of 2012: This image shows a Willys Dealership in the East Bay area near Oakland, Ca. Donham’s Willys dealership operated from 1953 through 1956.