With a focus on local government's role in participatory cultural governance, this paper argues two points. First, self- and critical reflexivity of institutional brokers is important to community-wide capacity building for participatory cultural governance. Second, this reflexivity can be enabled through slow, inquiry-based collaboration between practitioners and researchers. The paper presents the experiences of a practitioner-researcher collaboration between a local authority arts officer and a cultural policy scholar in the development of a place-based local arts development programme taking place from 2017 to 2019 in Dublin, Ireland. The paper surfaces how efforts to promote greater participation in local decision-making require acts of reflexivity as core to the repertoire of capacity building for enabling participatory cultural governance practice in local public arts administration. Three interrelated factors are determined to have helped enable this reflexivity: (1) the arts officer's openness to engage in collaborative processes that (2) emphasised reflection and learning and were supported by (3) the presence of an embedded researcher with mutual interest, beliefs and experience or knowledge of the institutional context. Limitations in the study highlight areas for further research regarding the affective nature of practitioner-researcher collaborations and the potential of promoting reflexive practice in processes aimed at promoting participatory governance.