The White House was the first public building in Washington, D.C. In 1790, a $500 prize was offered for the best design. Hundreds of proposals were submitted, including one from Thomas Jefferson, who submitted his design anonymously
Construction—mostly by slave labor—took eight years and cost $232,000, about $75 million in 2017 terms. Here: "A Vision Takes Form" - Peter Waddell's magnificent painting of the White House under construction (cc: @TownerB)