Hakaniemi is a district of Helsinki, the Finnish capital. It is considered a part of the Helsinki city center. Historically, it was often associated with the poor and working class people. However, the cost of living has risen considerably in recent years and is now on par with the rest of the downtown area of Helsinki. The best-known features of Hakaniemi include a large and lively marketplace, the headquarters of several trade unions, the headquarters of one of the largest political parties in Finland (SDP), and the Helsinki Hilton hotel. Famous buildings include the Ympyrätalo building (architects Heikki and Kaija Sirén , 1968) and the Hakaniemi Market Hall (architect Karl Hård af Segerstad , 1914).