My guess is county setbacks pushed it so far off the road that because of the slope they couldn't profitably build it on grade with a walk out basement. You can bet the builder got a deal on the land.
That must be fun getting into the garage ! Gunning it up that 20-30º slope then into one of the two doors.I drive past this new built house often and I don’t know how he got a permit as the city has very strict codes .