Trapani runs Christie’s International Real Estate Sereno, one of the brand’s largest US affiliates with more than 600 agents who do over $5.5 billion in annual sales. In a move rarely seen in the industry, Trapani helped orchestrate the reacquisition of the Silicon Valley-based firm in early 2025 after selling it to At World Properties in 2022. Trapani began his real estate career in 1990 and co-founded Sereno in 2006.