 In 2014, he sold Francis Bacon's "Portrait of George Dyer Talking" (1966), for $70 million to an American collector at Christie's London.It described Martínez's residence in the Time Warner Center (80 Columbus Circle) as “one of the most expensive apartments in Manhattan,” purchased in 2003 for “about $42 million.” His New York apartment “over 15,000SF combo apartment that spans on the 76th & 77th floors.Has a two-story living room and a reflecting pool,” and a “special system has been rigged to support one exceptionally heavy piece of art.”

The Mexican media refer to Martínez as a “ghost investor.” One source calls him a “a discreet man” who despite his massive investments remains widely “unknown.” Reportedly, only one photograph of him can be found on the Internet, which was taken by Kirchner's photographer, Bugge Victor, the official photographer for Argentina presidency, at Argentina's consulate in New York.