How much did The Biltmore Estate cost in 1888?

The Biltmore Estate, completed in 1895, cost approximately $5 million to build, which would be equivalent to around $150 million today when adjusted for inflation. The estate was constructed by George Washington Vanderbilt II and is the largest privately owned home in the United States. Its grand architecture and extensive grounds reflect the wealth and status of the Vanderbilt family during the Gilded Age.