Abroad, Boffrand worked for the Duke of Lorraine (not yet a part of France), where he was appointed "Premier Architecte" to Duke Léopold in 1711, but little of significance remains. He also constructed a fountain and a hunt pavilion, Bouchefort, in the gardens of the schloss belonging to the Elector of Bavaria, Maximilian II Emmanuel. In 1724 Boffrand worked on site at Würzburg with Balthasar Neumann, who had been consulting him in Paris, on the Prince-Bishop's Residenz (under construction 1719–1744). His designs were carried out in the main suite of rooms, where Fiske Kimball detected Boffrand's artistic control in the stuccowork by Johann Peter Castelli of Bonn.