The core activity of Willi Treuhand & Immobilien GmbH encompasses three main areas:
1. **Real Estate**: The company offers real estate services, including renting and buying properties, marketing and managing properties.
2. **Trust Services**: The company provides trust services, including support with asset management and transaction processing.
3. **Business Consulting**: The company offers business consulting services, including strategic consulting and support in solving business problems.
The company positions itself as a competent partner for private individuals and companies in the regions of Sarganserland, Walensee, Rheintal, and Graubünden.