Het Catshuis is the official residence of the President of the Netherlands.
It's main purpose is to send out news with the Presidential newspaper called(news from the tower (of power))
See also President of the Netherlands
The friends of the Het Catshuis used to be all former presidents until organizations are removed completely from the friends system.
In Real life the Catshuis has been the official residence of the prime minister (i.e. head of government) of the Kingdom of the Netherlands since 1963.
As Huis Sorgvliet it was built on the site of a former farm (probably part of the living quarters was worked in the left wing) by Jacob Cats (1577-1660), a prominent poet and politician who lived there since 14 July 1652. Originally it had only one storey.
In 1675 estate Sorghvliet came into the possession of Hans William Bentinck (1st Earl of Portland) chamberlain of the future king-stadholder William III (king of England) (1650-1702). His son, Willem Bentinck, had a bronze bell and tower installed in 1738.