The core activity of C-RE INVEST SA encompasses four main areas: 1. General Contractor: The company provides general contracting services for construction projects. 2. Real Estate: C-RE INVEST SA is also active in the real estate sector, which includes the purchase, sale, and management of properties. 3. Insurance Consulting: The company offers insurance consulting services to support clients in selecting and managing insurance policies. 4. Project Management: C-RE INVEST SA provides project management services to assist clients in planning, organizing, and executing projects.