Spanish colonial architecture is a building style rooted in the early Spanish settlements of the Americas, with its residential form refined in Southern California during the 1920s and 1930s. It is defined by stucco exteriors, clay tile roofing, arched openings, exposed wood beams, and handcrafted detail throughout. The Castella Estate in Centennial Hills is a ground-up custom home built in this style, designed to reflect the authentic character of a 1920s-era Santa Barbara home.