Where Did They Get The Money?

A community organizer turned president and a lawyer who has been out of work for 8 years can afford at least 3 multimillion dollar houses?
From the Daily Mirror: President-elect Trump isn't the only one thinking about splitting his time between two cities. 

When President Obama leaves the White House this January, his family is expected to become bi-coastal, with homes in both DC and California. 

Sources told the New York Post that the Obamas have purchased a home in Rancho Mirage, California....

The Obamas' main home - at least for the next two years - will be in the Kalorama neighborhood of DC. ...

In addition to their homes in DC and California, the family is said to have also purchased a vacation home in Hawaii, the president's home state. http://www.dailymail.co.uk/news/article-3957022/The-Obamas-going-bi-coastal-buying-home-California-well.html
Keep in mind they still have a house in Chicago.
Will the Secret Service have to keep agents at each house 24/7, just like they guard the empty Chicago house currently?
And where are they getting the money for houses?
And who is providing the financing for the homes?
Something stinks here.