One of the significant properties of this project is steep slope which led to height difference. The design inspired by the site topography and the employer′s demand about dwelling and using two generations of a family (father and son). Cutting the primitive volume and moving them vertically we earned two vertical volumes in two different levels. Thus, similar to inside of the project which two generations live together despite of differences, there is two parallel volumes on exterior face. These two volumes are separated from outside and attached from inside.