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Blake, Wm. The Lawn with the Kings and Angels. 1824.

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Silicon Valley billionaires are moving forward with their vision of a utopian green city between San Francisco and Sacramento. The development, involving over $800 million worth of rural land, would include 20,000 homes for 50,000 residents, all within walking distance of jobs, schools, bars, restaurants, and grocery stores.

This concept, known as a “15-minute city,” has been popularized in recent decades, especially in countries like China and France. Studies have found that the model of urban development boosts happiness and overall health.

California Forever, the company behind the new initiative, hopes to ultimately grow the city to 400,000 people, but only if it can create at least 15,000 jobs that pay above-average wages.

To actualize the plan, the company needs approval from Solano County voters to bypass protections put in place to keep agricultural land from being turned into urban space. So far, California Forever has purchased more than 78 square miles of farmland in Solano County.

Investors behind the project include philanthropist Laurene Powell Jobs, LinkedIn co-founder Reid Hoffman, and venture capitalist Marc Andreessen.

Critics worry about the impact on local infrastructure and the environment. California Forever must collect about 13,000 signatures from county voters to place it on the November ballot.