The Tongva Indians lived in the area of California where Los Angeles now is for 7,000 years before the Spanish came. They built permanent villages along streams and rivers. This house is like the ones they lived in, made from willow branches and reeds. The Tongva called their houses "Kiiy" (pronounced "key"). This one was built by modern Tongva for the mission's 100th anniversary.
The Spanish missionaries renamed them Gabrielinos after the name of the mission and you may hear or see that name.