Federal tax-return data for Mr. Trump and his business empire, which was disclosed by The New York Times last month, showed that even as he leveraged his image as a successful businessman to win the presidency, large swaths of his real estate holdings were under financial stress, racking up losses over the preceding decades.

But once Mr. Trump was in the White House, his family business discovered a lucrative new revenue stream: people who wanted something from the president. An investigation by The Times found over 200 companies, special-interest groups and foreign governments that patronized Mr. Trump’s properties while reaping benefits from him and his administration. Nearly a quarter of those patrons have not been previously reported.

The tax records — along with membership rosters for Mar-a-Lago and the president’s golf club in Bedminster, N.J., as well as other sources — reveal how much money this new line of business was worth…

Just 60 customers with interests at stake before the Trump administration brought his family business nearly $12 million during the first two years of his presidency, The Times found. Almost all saw their interests advanced, in some fashion, by Mr. Trump or his government.