The Atascadero Administration Building, generally called the City Hall, is the most prominent thing in town and the reason most travellers stop. A four-storey Italian Renaissance Revival pile in red brick, faced with terracotta, finished in 1918. The interior rotunda is open during business hours and worth a look for the marble floor, the dome, and the historical displays on Lewis's original colony plan.
The building anchors the Sunken Gardens, a small landscaped park that doubles as the town's main square for farmers' markets, summer concerts, and the Christmas tree lighting. Park benches, fountains, lawn — a pleasant five minutes' wander whether or not the building itself is open.