The Association for Behavioral Healthcare (ABH) represents over eighty community-based mental health and addiction treatment provider organizations serving 1.5 million Massachusetts residents annually. ABH holds a long history of collaboration with its counterpart PCA, the Massachusetts League of Community Health Centers (Mass League). The Massachusetts team is most proud of how far their relationship has advanced. For example, the associations have shared best practices for rapid telehealth expansion and identified areas for coordinated advocacy during COVID. The Massachusetts team’s work to prepare providers for telehealth through the Delta Center enhanced their ability to shift in a matter of weeks to offering care via telehealth -- for some now 100% of their services.