The core activity of Cortis AG is real estate development, particularly the development of residential properties. This includes: the acquisition of properties and land in northwestern Switzerland, especially in the Basel region; the renovation and new construction of properties; the marketing and sale of developed properties; the rental of properties; owner representation, where the company represents the interests of property owners and implements projects according to their specifications; and consulting and valuation of properties, including the creation of sales documents and the development of marketing strategies.