(Red Stone 1), now Westfries Museum, was built on the site of the 15th-century Proosten House, whose cellar and possibly some walls remain.
At the end of the 16th century, the Standing Councils of West Friesland and the Noorderkwartier, acting as a court, took up residence in the Proostenhuis. The tall and stately extension realized at the front in 1631-'32 has a late-Mannerist hard stone gable with a superposition of Tuscan, Doric, ionic and corinthian pilasters in the gable top with segmented pediment. This summit is flanked by richly worked claws with shielded lions, which show the weapons of the seven cities of West Friesland and the Noorderkwartier. The arms of West Friesland and the Prince of Orange were also placed in the façade. The lower hall was arranged as a meeting room and has a beam layer with mannerist key pieces on natural stone consoles (two still original). In 1729, the gate next to the facade was replaced by a wrought iron gate in Louis XIV style (J. Uljé). The façade on the small forecourt behind it was renovated in 1775. Leendert Viervant was commissioned in 1789 for an interior renovation, of which a marble inner gate and the garden hall in Louis XVI style remain.
In 1817 the State College was established as a district court, which was dissolved in 1877. In 1878 the Westfries Museum was established in the vacant space. In a major restoration of 1908-'11, the blue painted limestone facade of the Namur stone was replaced in gray stone. Since 1932 the entire building has been used as a museum and in 1953 a second major restoration was carried out.
The adjacent building Rode Steen 16 was bought in 1787 by the Committed Councils for administrative affairs. According to Jacob Otten Husly's plans - possibly together with his cousin Leendert Viervant - a new facade in Louis XVI style was created in 1789-90 with West-Friesland's coat of arms in the attachment. From that time on the empire windows and the pavement with poles and chains. The building later served as 'Groote Sociëteit' (1817-'79), coffee house (1884-1902) and bank (1902-'94). Since 1983 it has been part of the Westfries Museum and since 1994 in its entirety.
