The top floor of the William J. Clinton Presidential Library and Museum is dominated by a 5,000-square-foot private residence that is strictly off limits to the public.

The apartment atop the 153,779-square-foot library is for the exclusive use of the Clinton family and looks out over the Arkansas River and the city of Little Rock, Ark.

The “executive suite,” as it is called in city records, was completed at the same time as the $165 million library in November 2004.

In 2007, Bill Clinton commissioned a 14,000-square-foot garden on the roof of the modern glass building. It surrounds the penthouse and features 90 species of plants — including yellow roses, a favorite of his mom, Virginia Kelley.

When the size of Clinton’s private playground came under scrutiny in 2001, Tom Carpenter, an attorney for Little Rock, said most of the penthouse was devoted to office space and a conference room, with 2,000 square feet of private living space.

Clinton isn’t the only former president to include a residence in his library. George H.W. Bush’s library at Texas A&M University in College Station and Jimmy Carter’s in Atlanta both have them.