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1Cushman & Wakefield GmbH (January 2025): The German Investment Market 2024. https://www.cushmanwakefield.com/de-de/germany/news/2025/01/investmentmarkt-deutschland-2024

2Federal Environment Agency (n.d.): Energy-Efficient Renovation: Preserving Building Structures, Saving on Heating Costs, Protecting the Climate. https://www.umweltbundesamt.de/umwelttipps-fuer-den-alltag/heizen-bauen/sanierung

3German Energy Agency (dena) (2025): dena Building Report 2025. https://www.dena.de/infocenter/gebaeudereport-2025/