The programs were a press center for a golf tournament and sports facilities as required a large space with no-pillar, but the site was given at below the existing golf driving range. Rather than simply digging the basement with concrete, the driving range is as a roof, and instead of a huge structure, the roof is made into a small unitized two-layer grid shell to get a large span with reducing cost and keeping the natural landscape. And small divided double membrane is put at there so that hit golf balls are collected automatically with this mainbrane angle.