The Turkish Ministry of National Education has been implementing a new management model in the Turkish educational system. The structural features of state-run project schools are being developed with various innovations in terms of management and education models. Specifically, the new management model in which school principals share the authority to make their own teams is of great importance to researchers, educational policy makers, and executors. This study aims to designate the effects of project schools’ structural and managerial characteristics on teachers’ organizational commitment and the schools’ organizational sustainability. It was designed using a sequential mixed research method including scaling and interviewing techniques. In addition, the teachers’ organizational commitment levels in project schools, which were designated as the experimental group, are compared with the teachers’ organizational commitment levels in non-project schools, which were selected as the control group. The study, conducted in 2018–2019, is comprised of 15 project schools and 9 non-project schools located in Istanbul and involved 603 teachers working in these schools. The results show that the structural and managerial features of project schools have positive effects on teachers’ organizational commitment and that this school model seems sustainable, based on all the positive points gathered.