Senior Hall is a one-story rustic
log cabin structure that is or . It was designed by architect
John Galen Howard, the supervising architect for the university,
pro bono. Howard wanted the building to be "characteristic California Architecture" and chose a primitive vernacular style often used for early buildings in the state. Senior Hall was built from local redwood logs that are around twenty inches in diameter. The logs have bark on both the inside and outside of the building. It has a gable roof with wood shingles over a skip sheathing roof. It features copper flashing and gutters. The entrance is a large oak door. Inside, Senior Hall consists of a large meeting room and a small hidden chamber for the Order of the Golden Bear. The entrance to the secret chamber is hidden, giving no indication of the room's presence when closed. A large brick fireplace is located in the central wall, with openings to both rooms. In the main room, the fireplace had a cornerstone dated 1905. The north and south sides of the building have casement windows; amber glass is used for the secret room. Senior Hall still has its original furnishings and decor made from redwood. The secret room features a "throne". ==References==