America’s most expensive ZIP code has officially returned to California, as the artificial intelligence stock surge has catapulted Silicon Valley’s ultra-exclusive Atherton past Miami’s tax-free paradise of Fisher Island.

But while deep-pocketed tech titans are willing to fork over nearly $10 million for modest Northern California properties, real estate experts say the move signals a high-stakes trade-off: Buyers aren’t staying in the Golden State for its tax climate or resort lifestyle — they’re paying a massive premium to remain plugged into the nation’s primary deal-making hub.

“Atherton offers something that cannot easily be recreated…

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