Site: The site is located at the entrance of Sirikit oil field surround with small building. The PTTEP want to build 2000 s.q.m. 2 stories office building as a main office for the site. Ground: Ground is an important element of the design. It is a representation of” Oil” underground. By shifting ground up, the space under the ground plane which made of fold concrete slab and covered with grass can be used as an entrance to the building.