On the 19th of September 1987, Alternative Centregens received its accreditation as a charitable organization from the Inspector General, concurrent with the closure of the White Cross. On this date, the founding members instated a team of 5 administrators and Diane Laurent as director from 1987 until 1990. She was replaced by Michèle Sauvé who led the organization until 1997.
Alternative Centregens progressed continually throughout the years, with the number of registered members growing steadily, reaching 355 members in 1997. In the month of May 1997 the Montérégie Health and Social Services Agency broached the possibility of opening up a center in Brossard to welcome an Anglophone clientele.
The new centre was inaugurated on Lapinière street. In early April 2013, the centre moved to St-Hubert, and activities steadily picked up again. The Longueuil centre started to operate part-time in its new location on the Chemin du Tremblay.
In March 2013, with the approval of the Montérégie Health and Social Services Agency and United Way, Alternative Centregens hired a consultant to correct the difficult situation the organization found itself in. In January 2014, Jean Charbonneau took the position of interim director with the objective of stimulating member participation to the level it had been between 1997 and 2011. The first General Assembly concerning Activities for members was held in March 2014.
With the participation of the Board of Directors and the help of Nadine Geneviève Desjardins, community organizer at the CISSS Montérégie-Centre, Alternative Centregens has since worked towards assuring a healthy governance and regaining its prestige.