A substantial amount of rebuilding followed. In 1733, work began on the royal residence of Christiansborg Palace which was completed in 1745. In 1749, development of the prestigious district of Frederiksstaden was initiated. Designed by Nicolai Eigtved in the Rococo style, its centre contained the mansions which now form Amalienborg Palace. Major extensions to the naval base of Holmen were undertaken while the city's cultural importance was enhanced with the Royal Theatre and the Royal Academy of Fine Arts.