I'll just repeat what I wrote in the exterior view section: It was located on East Whittier Boulevard in Whittier CA, and if that makes you think of another Nixon, you’re right. Don, Richard’s brother.
In the short span of five years in the 1950s, Don managed to go out of business while doing some serious damage to brother Richard’s political fortunes.
He got into several pickles but the biggest issue concerned a 1956 loan of $205,000 he received from Howard Hughes’s tool company to rescue his failing restaurants.
It was, as you may have surmised, the Home of the Nixon Burger.