Tucked away in a leafy canyon across the street from Hotel Bel-Air is the first security gate. The Park Bel-Air, among the most prestigious new boutique developments in the United States, begins here. Behind the gate, the road turns uphill and splits three ways, leading to three more eventual security gates. No one knows yet exactly what will come next.

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The ultraprime developer Domvs London has secured permits to build three massive residences on the three hilltop lots, boastin…