The core activity of Angela Diener Immobilien-Treuhand GmbH is the provision of comprehensive real estate services, including: Consulting (rental law consulting, construction owner consulting, usage, object and market studies), Management of residential and commercial properties, Rental and sale of residential and commercial properties, Technical building management, Renovation management, Maintenance and renovations, Optimization of returns and profitability, Sustainable preservation and enhancement of value. The company offers these services as an independent and self-employed real estate service provider and focuses on the Greater Winterthur area.