2-level with sunken courtyard design

Quick answer：

A 2-level sunken courtyard design refers to an architectural arrangement where a courtyard is situated below ground level within a two-story building. This design often features a staircase or elevator to access the lower level, which can include living spaces, gardens, or other amenities. It allows for privacy and can create a unique aesthetic. Such designs are popular in modern architecture for their innovative and space-saving qualities.