Washington, D.C.: $22 Million - These Are The Most Expensive Homes For Sale In Every Southern State - Southernliving. One of Washington, D.C.'s most extravagant homes, this 2016 mansion designed by Jones/Boer Architects is 14,774 square feet of pure modern bliss. With an incredible marble kitchen, ornate fireplaces, and balconies galore, this house is the definition of luxury. The 8-bedroom, 10-full bathroom (and 3 half bath!) estate can be found at 3030 Chain Bridge Road.