Purpose: The objective of this article is to describe the implementation of the Skills Training in Affective and Interpersonal Regulation (STAIR), a manualized, evidence-based cognitive behavioral group treatment for childhood trauma at Cedar Centre, a community-based trauma treatment center, and describe the preliminary evaluation of the effectiveness of the treatment. Method: Pre- and postmeasurements of emotion regulation, interpersonal problems, and traumatic stress symptoms using psychometrically validated instruments were collected. Outcomes were assessed for 85 individuals who experienced childhood sexual abuse and participated in the first cycles of intervention at the center. Results: Results indicated significant reductions in difficulties in emotion regulation, interpersonal problems, and trauma symptoms among participants from pretreatment to posttreatment. Discussion: Overall, there was a positive response to the adoption and integration of the STAIR intervention into the program. Qualitative assessment identified the benefits perceived by both facilitators and group participants. [Paper presented at the Stockholm Conference on Behavioral and Social Intervention Research, 11-12 May, 2017.]