Before the construction of the Parliament House, the Parliament met in various different locations. The Diet of Finland, the predecessor of the Parliament, was tetracameral and did not regularly meet together. The Diet of Porvoo (1809) met in various buildings in Porvoo, with Borgå gymnasium as the main hall, the noble and burgher estates meeting in the town hall and the peasants' estate in chief judge Orraeus' house. However, the Diet assembled only once and did not reconvene until 1863. In 1863, the Diet began regular meetings again, reconvening in the House of Nobility (Ritarikatu 1). This building still stands, but is no longer in governmental use. Whereas nobility continued to meet there, in 1891 a new House of the Estates was inaugurated for the other estates (clergy, burghers and peasants). This building is today owned by the state and occasionally used by the Government of Finland. When the modern 200-member Parliament was founded in 1906, they first met in the local voluntary fire brigade house (Keskuskatu 7), because there was not enough space for them in the House of Estates. The fire brigade house was demolished in 1967 and replaced by the Helsinki World Trade Center building. In 1911, the Heimola House, a building designed by Onni Tarjanne, was inaugurated at Yliopistonkatu 5. This building was demolished in 1969 and replaced by a 9-story office building.