Bloomsbury (1823–46). This is Smirke's largest and best known building. In 1820, in his role as architect to the Office of Works, Smirke was invited to redesign the museum, although the complete design dates from 1823, and was for a building surrounding a large central courtyard with a grand south front, given the limited funds the work was divided into phases. It is built of brick with the visible facades cased in Portland stone. The first part to be constructed was the "King's Library" of 1823–1828, which forms the east wing. The north section of the west wing, the "Egyptian Galleries" followed 1825–1834. The north wing, housing the library and reading rooms, was built in 1833–1838. The west wing and south front were built in 1842–1846.