The building has classical inspiration sources, that can be found in the styles of the Roman architect Vitruvius and the Venetian architect Andrea Palladio; Palladio being an Italian architect of the Renaissance whose style evolved into Palladian architecture, which became popular in North American in the 18th century. Hoban's design is influenced by the upper floors of Leinster House, in Dublin, which later became the seat of the Oireachtas (the Irish parliament). Several other Georgian-era Irish country houses have been suggested as sources of inspiration for the overall floor plan, details like the bow-fronted south front, and interior details like the former niches in the present Blue Room. These influences, though undocumented, are cited in the official White House guide, and in White House Historical Association publications. The first official White House guide, published in 1962, suggested a link between Hoban's design for the South Portico and Château de Rastignac, a neoclassical country house located in La Bachellerie in the Dordogne region of France and designed by Mathurin Salat. Construction on the French house was initially started before 1789, interrupted by the French Revolution for twenty years and then finally built 1812–1817 (based on Salat's pre-1789 design). The theoretical link between the two houses has been criticized because Hoban did not visit France. Supporters of a connection posit that Thomas Jefferson, during his tour of Bordeaux in 1789, viewed Salat's architectural drawings (which were on-file at the college) at the École Spéciale d'Architecture (Bordeaux Architectural College). On his return to the U. S. he then shared the influence with Washington, Hoban, Monroe, and Benjamin Henry Latrobe.