Located at a soft ground closed to a canal in Binh Thanh District, HCM city, this office is required to design to meet functions of an architecture & construction office as well interior showroom. In additional, a lowest construction cost is also a client’s concern due to short term rental of this site from 5 to 10 years only. Under those circumstances, the idea using cheap local materials, easy to construct in a short-time and re-used ability was raised as a key design direction. The curved stone-walls made by many piled-up-steel-cages contained rocks inside to reduce horizontal force seem to be a suitable solution for this project. Furthermore, they also create the interesting spaces with different views to gardens as seeing from both inside and outside.