By 1939, the last addition to the clubhouse had been made, that of enclosing the open back porch area for additional space. 62 years later in 2001, the west wall was reconstructed with floor-to-ceiling windows opening onto a 12 ft. by 40 ft. deck with steps going down to what is now the wedding garden.
The City flagpole had become so unsafe, the Club replaced it. Dry rot was discovered in the pergola and porch at the front entry of the clubhouse, so it was replaced by a concrete and brick patio. In 1951, a parcel of land was purchased to the rear of the clubhouse, which completed the garden.
Through the years the Clubhouse has been used by its members for community, social, civic, literary, cultural and self-improvement activities. The regularly scheduled second and fourth Thursday afternoon luncheons and teas are followed by programs of interest to the membership. They also hold many other meetings involved with gardening, book readings, civics and conservation, community services, clubhouse maintenance, operations and ways and means planning. There are some evening activities, such as a St. Patrick's Day party and a Christmas dinner dance.
The Club offers classes and programs under the Cultural Arts Section. In addition, the Clubhouse is rented for weddings, reunions and meetings. It would be impossible to count the number of Marin County and San Francisco marriages that began in the garden and Clubhouse of the Outdoor Art Club.
The Club's Community Service section makes and distributes, photos, pillows, shawls, bed socks and lap robes to rest homes throughout Marin County at Christmas. In the past, bingo parties and an annual Christmas party were held at Mill Valley rest homes.
The Civics and Conservation Section monitors local governments, discusses pros and cons on many issues of current community interest and encourages the Club's members to be knowledgeable on many issues of concern to the Club and the community. Through this section come many financial gifts from the Club to conservation causes. For example, they purchased and gave the new section of land adjoining Old Mill Park to the City to complete the park; led the campaign to purchase the Redwood Grove adjoining Miller Grove Park; sponsored and paid for a map of Cascade Falls Park; and worked with local groups to purchase equipment and material for local park renovation.