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Castor Architecture is based in Mill Valley, CA with projects from Marin County to the Wine Country, San Francisco and the Peninsula. Well acquainted with the production culture of larger firms, we choose instead to maintain a small team focused on doing a few things at a time - and doing them well. We specialize in single-family residences, from estates and new construction to additions and renovations. Because the home exemplifies what called us to architecture in the first place - not only that we can achieve beauty, but that we can also make room for happiness.