Samenvatting

There is much research available about the development and government participation of new political parties (e.g. Pedersen, 1982; Deschouwer, 2008). Scholars show that survival for new political parties is often difficult, as they in general had little time for party building (Bollyer & Bytzek, 2017). Moreover, the expectation for specific types of new parties, mainly anti-establishment parties, is that they pay a high(er) electoral price when participating in government (Van Spanje, 2011). The Dutch case of the local political party of ‘Leefbaar Rotterdam’ (Livable Rotterdam, LR) is a noteworthy exception to this rule. It won the Rotterdam local election in 2002 with almost 35 percent of the votes, only months after its establishment. Until this day, LR remains an electorally large and relevant political party, participating in Rotterdam government twice (2002-2006 and 2014-2018). The article shows that in comparison to some national new political parties, LR succeeded in building a solid party organization and that from a party institutionalization perspective, it can be considered an institutionalized party. Regarding theory, it provides some additions to party building literature, such as the importance of personal relations and the balance between organizational unity and member autonomy.