Quick searched reveals that the Santa Nella location is being remodeled
https://sfstandard.com/2024/01/10/central-coast-landmark-pea-soup-andersens-closes/
Road trippers leaving San Francisco for Southern California know that there are two places to stop for excellent split pea soup and even better fried chicken: the Pea Soup Andersen’s on U.S. 101 near Solvang, and the other Pea Soup Andersen’s on Interstate 5 in Santa Nella.
A year shy of its centennial, the 101 location—in the Central Coast town of Buellton, technically—has closed, as SFGate first reported. An icon of kitschy Danish culture recognizable by its windmill, it is slated to be demolished and rebuilt.
The Santa Nella location will remain open, as manager Armando Hurtado confirmed with The Standard.
“They’re going to redevelop it and make a new restaurant,” he said. “It’s going to take about a year. We’re not going anywhere.”
A pity. I love the old place though it’s 300 miles away and I’ve only been there a handful of times in my life