Modified and reconstructed in several stages over two decades beginning in 1772, the former Lubomirski Bath-House was eventually transformed into the elegant classicist Palace on the Isle. Throughout the gardens, many new structures were built and adorned by architects Dominik Merlini and Jan Chrystian Kamsetzer, painters Jan Bogumił Plersch and Marcello Bacciarelli, and sculptors Andrzej Le Brun, Jakub Monaldi, and Franciszek Pinek. In 1774 a White House was erected in the form of a simple hexagon with comfortably appointed interiors. According to legend, the king's mistress, Elżbieta Grabowska, as well as his sisters resided in the manor. From 1775 to 1783 the Myślewicki Palace was built opposite the Bath-House. Originally it took the form of a cube built on a square, to which eventually wings were built on and subsequently elevated. During the 1770s the hermitage, which had been damaged by lightning, was restored and one of the king's companions, Teresa Lhullier, took up residence there.