THE ELBO is a building located in Surabaya City area. As the name implies, this building has two main function which is  boarding houses and private residences separated by front and back zoning by utilizing the two faces of the building.

The basic concept that is trying to be applied to this building is the Upper House, where the building is placed as if it is separated from the ground to vertically distinguish functions. This separation of zoning aims to differentiate between public, semi-public and private zoning. Which is public zoning intended as a commercial area, service and a relaxing area for tenants. Semi-public is used as a boarding zone, while the private zone is used as a residential area. The application of the green design concept is also embedded in this building, with the application of cross ventilation where air can directly enter the building through the corridor naturally. In addition, light is optimally inserted right in the void area of ??the stairs in the middle of the building. The void uses glass to maximize sunlight during the day. Placement of plants on the sidelines corridor as a counter negative area and building shade. Visibly, this building has overlapping box masses wrapped in vines as a cooling building facade.