With increasing numbers of elderly people in need of care and social connection, countries undergoing advanced demographic transitions experience increasing interest in community-based housing models for seniors. Advantages include bigger opportunities for social interaction and mutual help among residents, resulting in better physical and mental wellbeing. In some cases, shared facilities can also provide affordable alternatives to market housing. Seeking to speed-up and scale-up the development of community-based housing, and to respond to the increasing demand, a variety of new developer-led senior housing concepts are arising in Denmark and The Netherlands. In this paper, we conduct a comparative case study to explore how these new concepts contribute to scaling-up community-based housing, including their effectiveness to fulfil societal aims. Findings shed light on the potential and challenges for these concepts across three main themes: the ownership of the communal, the creation the community identity, and the commitment of their residents. ; With increasing numbers of elderly people in need of care and social connection, countries undergoing advanced demographic transitions experience increasing interest in community-based housing models for seniors. Advantages include bigger opportunities for social interaction and mutual help among residents, resulting in better physical and mental wellbeing. In some cases, shared facilities can also provide affordable alternatives to market housing. Seeking to speed-up and scale-up the development of community-based housing, and to respond to the increasing demand, a variety of new developer-led senior housing concepts are arising in Denmark and The Netherlands. In this paper, we conduct a comparative case study to explore how these new concepts contribute to scaling-up community-based housing, including their effectiveness to fulfil societal aims. Findings shed light on the potential and challenges for these concepts across three main themes: the ownership of the ...