After the success of Graha XC, PT Permata Cahaya Indah initiated an idea of building in Kelapa Gading . The new tower of Graha XB was built on a medium?sized site (under 2.000 sqm ). Getting several insights from provious project, Graha XB tower is able to accommodate two owners with equal facility, all under one same roof. The concept of a simple and modern building was taken previously from Graha XC project, whereas the street?facing? facades become the main characteristic. Building fa├žade uses clear glass technology that adapt low energy usage. The curtain installation was combined with tilted glass as the solution to the unfavorable west?view. To add office room efficiency values, the architect also mode the service area 20% bigger than functional area.