Doyle made his most ambitious foray into architecture in March 1912, while he was staying at the Lyndhurst Grand Hotel: He sketched the original designs for a third-storey extension and for an alteration of the front facade of the building.[112] Work began later that year, and when it was finished, the building was a nearly exact manifestation of the plans Doyle had sketched. Superficial alterations have been subsequently made, but the essential structure is still clearly Doyle's.[113]