In 2006, Ai and HHF Architects designed a private residence in upstate New York. According to "The New York Times", the Tsai Residence is divided into four modules and the details are "extraordinarily refined". In 2009, the Chicago Athenaeum Museum of Architecture and Design selected the home for its International Architecture Awards, one of the world's most prestigious global awards for new architecture, landscape architecture, interiors and urban planning. In 2010, "Wallpaper" magazine nominated the residence for its Wallpaper Design Awards category: Best New Private House. A detached guesthouse, also designed by Ai and HHF Architects, was completed after the main house and, according to New York Magazine, looks like a "floating boomerang of rusty Cor-Ten steel."