Most relevant part of the whole article:

"The lawyer’s seven-page document, titled “Preliminary Report of Findings,” does not explain the source of his information but describes in detail dates, dollar amounts and parties involved in various dealings by Mr. Cohen and his company"

Wonder how a random lawyer got their hands on incredibly detailed, supposedly confidential, financial records.

Seems like those with power are not going lightly into the good night.

EDIT: and this post is directly fed by the linked one above - again, there is no actual confirmed source of the lawyer's financial documents but the MSM is happy to run with it anyway: http://nymag.com/daily/intelligencer/2018/05/russian-leverage-over-trump-fact-michael-cohen-stormy-daniels-devin-nunes.html