Kammarrättens hus, Birger Jarls Torg 13

Kammarrättens hus, at Birger Jarls Torg 13 on the island of Riddarholmen, is widely regarded as Sweden's first purpose-built office building. It was constructed between 1804 and 1807 in neoclassical style on the ruins of the earlier Kruusiska huset, which had burned down in the great Riddarholmen fire of 1802. The architects Fredrik Blom and Carl Fredrik Bouck designed it with offices arranged along a central corridor and fireproof vaulted chambers for archival storage — a pioneering approach at the time. The building is physically joined to the adjacent Sparreska palatset, a noble palace erected in the late 1630s by councillor of state Peder Eriksson Sparre on a plot granted by the regency government of Queen Christina. Sparreska palatset is considered one of the finest and best-preserved early 17th-century buildings in Stockholm, modelled on the Italian villa tradition, with strictly symmetrical facades, a hipped roof, and a terrace facing Riddarfjärden. Both buildings were extensively restored between 2009 and 2011 by Statens fastighetsverk, recovering their original exterior and interior colours. Since 2011, the two interconnected buildings together house the Supreme Administrative Court of Sweden, Högsta förvaltningsdomstolen.