An investment banker is offering to trade his 13-acre Mill Valley estate for Anthropic equity, creating an unusual bartering opportunity in the Bay Area's tightening real estate market. Storm Duncan, who bought the property in 2019 for $4.75 million, launched a LinkedIn page seeking a buyer willing to exchange shares in the AI startup. The property is currently occupied by a prominent venture capitalist, though Duncan declined to name them.

Duncan frames the proposed swap as a strategic diversification move, saying he's under-concentrated in AI investments relative to the sector's future importance and over-concentrated in real estate. The deal structure would allow the buyer to retain 20% of the upside value during the stock lockup period without requiring an outright share sale. This creative approach targets Anthropic employees who may face the opposite problem—too much equity and too little real estate.

The unconventional listing highlights how AI company employees are navigating wealth management challenges as their companies' valuations soar. Duncan, a longtime Bay Area resident who relocated to Miami during the pandemic, is betting that an Anthropic employee seeking to diversify out of company stock might find the 13-acre property an attractive alternative to cash.