548 Market St: the mailbox address used by Anthropic, OpenAI and more
sahilypatel · x · 2026-11-07
548 Market Street in San Francisco may be the most valuable address in tech — it's the official address on Anthropic's IPO filing, OpenAI's ChatGPT invoices, Substack, Zapier and Gumroad. It's actually just a mailbox: a company called Earth Class Mail opens and scans the letters.
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