For this credit, the existing building structures (i.e. structural floor and roof decking) and components (i.e. exterior skin and framing) should be reused in the project as much as possible. The points will increase as the step according to percentage of existing building reused in the project: 1 point for at least 55%, 2 points for at least 75%, and 3 points for 95% and above. The percentage calculation will not take into account for hazardous materials because they have high risk to affect to occupants’ health. Additionally, this credit cannot be applied for the project which expands the area more than 2 times of the existing building’s floor area. The project team also should improve the building components for increasing energy and water efficiency.