Which unique requirement must be met for a building to achieve full Living Building Challenge certification?

The architecture industry is increasingly focused on sustainability initiatives that go beyond traditional green building certifications. The Living Building Challenge represents one of the most rigorous sustainability standards in architecture today, pushing the boundaries of what's possible in environmentally responsible design. Test your knowledge about this cutting-edge certification program that's reshaping how architects approach sustainable design.

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The building must generate 105% of its energy needs through renewable sources, operating with net-positive energy for at least 12 consecutive months
The building must be constructed using only materials sourced within a 500-mile radius of the construction site
The building must be designed to last at least 200 years with minimal maintenance requirements
The building must incorporate living walls that cover at least 30% of its exterior surface area