RobertLarsen said:
The majority of the neighborhoods in Lag Niguel use 3-car frontal garages. I can see your opinion on curb appeal, but it's better than a 2 car garage door with a tandem spot. I'm also curious about these structural issues. I haven't heard of any issues in the 20+ years that the neighborhoods have been around.
Seismic forces move from left to right and back and forth. The weight directly above the garage will contribute to its failure when its top heavy moving its center of gravity higher off the ground. High center of gravity is the most dangerous for tall SUV subject to lateral forces. The house shown has virtually no shear walls and diagonal cross bracings to resist the lateral movement. We all have built those cheap metal shelving or Ikea bookcases and how all of them wobbled until we installed the shear backing or X bracing across the back.
The same idea must be applied to the front of the house for structural integrity. The big earthquake is long over due. There must be 2 shear walls on each side of the garage opening. Wall ratio must be a minimum width of 1/2 the height from ground to roof. For this house the first floor is 9' therefore there should be 2- 4-1/2 wide walls anchoring the openings. Many cities have relax standards and builders will only provide the minimum to satisfy the inspection but it does not mean that it is safe.
For those who plan to live in the garage you have no idea how un-safe it is when an earthquake hits.