On the 74th floor of the Time Warner Center, Condominium 74B was purchased in 2010 for $15.65 million by a secretive entity called 25CC ST74B L.L.C. It traces to the family of Vitaly Malkin , a former Russian senator and banker who was barred from entering Canada because of suspected connections to organized crime. Last fall, another shell company bought a condo down the hall for $21.4 million from a Greek businessman named Dimitrios Contominas, who was arrested a year ago as part of a corruption sweep in Greece. A few floors down are three condos owned by another shell company, Columbus Skyline L.L.C., which belongs to the family of a Chinese businessman and contractor named Wang Wenliang. His construction company was found housing workers in New Jersey in hazardous, unsanitary conditions. Behind the dark glass towers of the Time Warner Center looming over Central Park, a majority of owners have taken steps to keep their identities hidden, registering condos in trusts, limited liability companies or other entities that shield their names. By piercing the secrecy of more than 200 shell companies, The New York Times documented a decade of ownership in this iconic Manhattan way station for global money…