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Join the app of OPUS - La Défense and enjoy many services
Join the app of OPUS – La Défense and enjoy many services directly from your mobile.
OPUS – La Défense is a simple, practical & secure application to stay informed and communicate within a building.
The application allows you to :
- follow what's happening at OPUS – La Défense in real time, with your building's news
- to chat with other building's occupants via messenger or a forum
- benefit from services to simplify your daily life: concierge services, reservation of common areas or goods and all other third party services integrated into the app.
What's New in the Latest Version 5.1.0
Last updated on Feb 10, 2026
Feature improvements and bugs fixes.
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OPUS – La Défense
5.1.0 by MonBuilding&Co
Apr 24, 2026