Alliance Développement Capital SIIC (ADC SIIC) is a Société Européenne (SE) and listed real estate investment company (REIT) that specializes in owning and managing a diversified portfolio of residential, commercial, and office real estate properties. The company offers rental services for residences comprising 75.9% of its holdings, commercial spaces at 19.1%, and apartment buildings at 5%, with a total exploitable area of 5,384 square meters valued at EUR 37.9 million as of mid-2025; it also holds strategic equity participations including 27% in Dual Holding (Switzerland), which owns high-standing properties worth EUR 19.8 million directly and indirectly, and 50% in Hillgrove Investments Group, controlling a property in London via an English subsidiary valued at EUR 5.4 million. Operations focus primarily on properties in Paris and its suburbs, with additional international exposure in Switzerland and the United Kingdom. Founded in 1923 and headquartered at Avenue de l'Astronomie 9 in Saint-Josse-Ten-Noode, Belgium, the firm pursues an opportunistic investment strategy dependent on market opportunities and bank financing, and it is listed on compartment C of Euronext Paris under ticker ALDV.PA. Recent financials as of June 30, 2025, show consolidated net revenues of EUR 420,000, down 5.3% year-over-year due to higher non-recoverable charges despite rent indexation gains, alongside a EUR 1.4 million share of losses from equity-accounted entities primarily tied to Dual Holding's divestment activities.