"It's not easy to be a shopping mall these days," Reed Moulds, managing director at Sand Hill, tells FastCo.Exist. "We've done some research and we haven't found a single shopping mall that's started construction since 2006. This is clearly a dying model. That's on display at Vallco."

Vallco is a shopping mall in Cupertino, California—a stone's throw from Apple headquarters in the middle of suburban Silicon Valley. And apparently, it has seen better days. "Half the stores are empty, the food court is abandoned and people leave Yelp reviews talking about their fear of zombie ambushes in the eerie corridors," says FastCo.Exist.

That's where Moulds comes in. He's the developer behind a $3 million project to turn the derelict building around. The mall and adjacent parking are set to be transformed into "a vibrant, sustainable, walkable and safe new neighborhood with a mix of retail, dining, entertainment, recreation, offices, housing, open space and public amenities," according to the company's website. And the entire space would be topped with a 30-acre green roof—the largest in the world.

The proposed project is called The Hills at Vallco and if approved by the city of Cupertino in 2016, the new site would be truly remarkable. The whole site is designed to be walk- and bike-friendly with refreshing dense, mixed-use planning and town squares for farmers markets. Moulds plans to personally fund a shuttle service in the area since the rest of the city is so car-dependent. The green roof would include an impressive 3.8-mile trail network "for jogging and walking, vineyards, orchards and organic gardens, an amphitheater, children’s play areas and a refuge for native species of plants and birds," say the developers.

As if the project could get any cooler, it's also aiming to be as ecologically sound as possible. The project is aiming for LEED Platinum certification, the highest LEED rating. Developers also plan to use recycled water for irrigation, heating and cooling, and recapture rainwater to reduce water consumption.

"The sustainable park will feature native, drought-tolerant and climate-responsive landscaping that thrives on little to no water," says Sand Hill. "The green roof, natural ventilation and smart technology will ensure energy efficiency—keeping buildings and surroundings cool in the summer and warm in the winter."

"I think there's going to be a lot of opportunities to be very creative about how we reinvent our malls that aren't used the way that they've been used in the past," Moulds told Fast Co.Exist. "This was an organic approach, driven by community engagement, that at the end of the day resulted in the largest green roof in the world."

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