The Obamas might not be the wealthiest Americans, but they're moving into the nation's most valuable home

It’s not for sale, but the Obama family is moving into what could be the nation’s most expensive home, according to

Zillow estimated that the White House — if it was put on the market as a residence — would be valued at about $308 million. But the estimated value has fallen about 7% or $23 million from a year ago.

The Zestimate took into account 1600 Pennsylvania Avenue’s physical attributes, recent comparable sales and local market trends. The 55,000-square-foot White House has 132 rooms, 35 bathrooms, 16 bedrooms, 3 kitchens, and 18 acres of land in downtown Washington, the Web site said.

“Zillow’s statisticians deemed the White House the most historic home in America and applied a maximum historical premium to their models to determine a Zestimate value today of $308,058,000,” the Web site said.

Zillow estimated that one would need to earn $55.3 million a year to afford a 30-year fixed-rate mortgage for the house. And by the way, the 20% downpayment would be $62 million.

Before it's here, it's on the Bloomberg Terminal.