The Trump Organization planned to give Russian President Vladimir Putin a $50 million penthouse in the proposed Trump Tower Moscow as the project was being pitched in Russia during the heat of the 2016 U.S. presidential election, Buzzfeed News reported Thursday. The building project eventually fell apart and it was unclear if Donald Trump knew about the details, Buzzfeed said. Citing four sources, including Trump business associate Felix Sater, who claimed credit for the idea, Buzzfeed said Michael Cohen led negotiations into the summer of 2016, despite public claims that the project was scuttled that January, before Trump had secured the Republican nomination. Cohen, then Trump's personal attorney, reportedly talked about the idea with Putin's press secretary. Sater told Buzzfeed that he came up with the idea of giving Putin the building's best apartment, and that Cohen approved it. "In Russia, the oligarchs would bend over backwards to live in the same building as Vladimir Putin," Sater told BuzzFeed News. "My idea was to give a $50 million penthouse to Putin and charge $250 million more for the rest of the units. All the oligarchs would line up to live in the same building as Putin." Neither Cohen nor the Trump Organization responded to questions from Buzzfeed. On Thursday, Cohen pleaded guilty to lying to Congress about the Trump Tower Moscow real estate project. In a separate report Thursday, Yahoo News reported special counsel Robert Mueller's investigation has looked into the actions of two of Trump's children, Ivanka and Donald Jr., concerning their roles in the Trump Tower Moscow project.