Question: What is the acreage of the mansion owned by the artist who recorded Way Down?

Context paragraphs:
Graceland: Graceland is a mansion on a 13.8 acre estate in Memphis, Tennessee that was owned by Elvis Presley.  It is located at 3764 Elvis Presley Boulevard in the vast Whitehaven community, about 9 miles (14.5 km) from Downtown and less than four miles (6 km) north of the Mississippi border.  It currently serves as a museum.  It was opened to the public on June 7, 1982.  The site was listed in the National Register of Historic Places on November 7, 1991, and declared a National Historic Landmark on March 27, 2006.  Graceland is the second most-visited house in America with over 650,000 visitors a year; second only to the White House.

Terry Mansion: The Terry Mansion is a Victorian style mansion owned by the city of Little Rock, Arkansas.  It is the former home of prominent philanthropist and political activist Adolphine Fletcher Terry.  She and her sister Mary Fletcher Drennan willed the family mansion to the city, for use by the nearby Arkansas Art Center.  It has been a municipal building since 1964.  It served as the Arkansas Decorative Arts Center from 1985 to 2003.

Bill Gates's house: Xanadu 2.0 is a mansion owned by Bill Gates that overlooks Lake Washington in Medina, Washington.  The 66000 sqft mansion is noted for its design and the technology it incorporates.  It is nicknamed Xanadu 2.0 after the title character's estate in "Citizen Kane".

Betts House (Yale University): Betts House, also known as the John M. Davies House or Davies Mansion, is a mansion owned by Yale University in the Prospect Hill Historic District of New Haven, Connecticut.  Completed in 1868 and designed by Henry Austin, it was sold to Yale in 1972 and is now home to the Yale Center for the Study of Globalization and the Yale World Fellows program.

Elwood Haynes Museum: The Elwood Haynes Museum is a museum in the former mansion owned by Elwood Haynes located in Kokomo, Indiana.  Haynes was an inventor who is credited with being the first to produce cars commercially in 1894.  He also invented stainless steel and stellite.  He became a millionaire in 1916 and had the mansion located on south Webster Street built, where he lived until his death in 1925.

The Mansion (recording studio): The Mansion is a 10-bedroom mansion owned by music producer Rick Rubin in the Laurel Canyon area of Los Angeles.  Originally built in 1925, the house is famous for the successful bands who have recorded music there.  Although </ref> no one has ever lived in the Mansion under the name "Houdini", a fact that Corey Taylor, singer of the bands Stone Sour and Slipknot, has said in his book "A Funny Thing Happened on the Way to Heaven".  The book also describes his paranormal experiences in the Mansion while recording Slipknot's 2003 album "".  After recording the Red Hot Chili Peppers' "Blood Sugar Sex Magik" with considerable ease and comfort, Rubin decided to use the mansion to record many of the albums he has produced, including the Red Hot Chili Peppers's "Stadium Arcadium", Audioslave's "Out of Exile", The Mars Volta's "De-Loused in the Comatorium", Slipknot's "", and Linkin Park's "Minutes to Midnight".

Blennerhassett Island Historical State Park: Blennerhassett Island Historical State Park is a state park located on Blennerhassett Island, a small island in the Ohio River, located in Wood County, West Virginia, USA.  The property was the site of a Palladian mansion owned by Harman Blennerhassett, a participant in some of the alleged intrigues of Aaron Burr, and his wife Margaret Agnew.  While the original mansion burned to the ground long ago, a detailed replica, which can be toured, has been built on its foundations.  The Blennerhasset mansion greatly resembled George Washington's Mount Vernon, due to its Palladian style.

BU Castle: The Boston University Castle (or BU Castle or simply "The Castle") is a Tudor Revival-style mansion owned by Boston University on Bay State Road.  The school typically uses it for receptions or concerts, but also rents out The Castle to cater events and special occasions.

Way Down: "Way Down" is a song recorded by Elvis Presley.  Recorded in October 1976, it was his last single released before his death on August 16, 1977.  The song was written by Layng Martine, Jr. and was later covered by Status Quo and Cliffhanger.  Presley recorded the song at his home studio in Graceland on 29 October 1976.

Burlington House: Burlington House is a building on Piccadilly in Mayfair, London.  It was originally a private Palladian mansion owned by the Earl of Burlington, and was expanded in the mid-19th century after being purchased by the British government.

Supporting paragraphs: Way Down Graceland
Answer: 13.8