Urban Concept is suitable for metropolitan city, one of them is Surabaya, where is the site of this building. And I applied the recycle material concept from the water hyacinth, which is can found easily in the river near the site. This water hyacinth can be use for hardboard material ( GRC ), as natural fiber combined with hard material. So this can be a solution for river pollution. And it’s also can be an artistic material for furniture or interior detail.