InstitutionalsThe secret to successful transformation lies in inventory

The real estate industry is facing huge challenges in the face of the required transformation. This concerns the topics of sustainability and energy efficiency, but also changed usage concepts and higher quality requirements, for example due to the requirements of “New Work”. The necessary changes can and must already be implemented in new buildings. But new construction alone cannot be the solution. The much greater lever lies in upgrading the stock.
Time to read8 min.
updated at04/07/2026
CategoryConversion in stock
Different wall textures: Metal, brick, wood and concrete arranged in geometric shapes.

21 million buildings

There are nearly 21 million buildings in Germany that are not residential buildings.1 Demolishing these within a very short time and replacing them with new buildings would firstly be unrealistic, secondly not desirable in most cases and thirdly also counterproductive from an environmental or climate policy perspective: 

Unrealistic because there is neither the construction capacity nor the capital to be mobilised. Not desirable because they are often preservable buildings in the context of historically grown neighbourhoods with cultural value. And environmentally counterproductive, because demolition and new construction would release so much CO₂ that it would take decades for these emissions to be amortised by more energy-efficient operation - partly longer than the life of the building.

The Bundesstiftung Baukultur (Federal Foundation for Building Culture) estimates that only 8 percent of the building stock in Germany will consist of new buildings in 2035 (from construction year 2022). Of the 92 per cent of old buildings, around 30 per cent are considered particularly preservable buildings, and 3 per cent as monuments.2

Consequently, the transformation of the building stock can only be successful by adapting the stock to new requirements and thus making it fit for the future. Because only if current and future needs are taken into account can climate resilience and long-term use go hand in hand with profitability and economy. 

Every building is unique, which is why the necessary measures vary from property to property. However, energy renovations are almost always part of a package of measures. In addition to modernisations, attachments or extensions are also possible.


 

Developing stock means preserving historically grown neighbourhoods

Renovation projects must preserve the history and character of a property and add value to the city district. This is often also about preserving cultural values. Nadia Eichelberger, Global Head of Real Estate Office & Industrialat Commerz Real, explains the challenge: "To integrate the DNA of what exists and enrich it with a new vision. Developing an understanding of the environment, implementing inclusive planning as well as a long-term orientation of the product and acceptance in citizenship are essential success factors for the conversion." In doing so, you have the opportunity to “rethink what exists and translate it into concepts that can last for many decades”. Böhnlein sees this as an obligation for his industry: “Who, if not us as asset managers, now have to start implementing intelligent conversion concepts and long-term planning with the existing assets.”

“Instead of demolition and new construction, existing buildings need to be refurbished and further developed,” confirms Sarah Dungs, Chairwoman of the Verband Bauen im Bestand. This reduces CO₂ emissions exactly where they occur. However, there is also something to consider: “The problem is known, but not least our mindset and decision assumptions, as well as applicable laws and regulations, make demolition and new construction often appear more profitable than building in existing buildings.”



The figures speak for preserving inventory

The facts are known: The building sector is responsible for about 40 percent of direct and indirect global CO₂ emissions, but it also binds a third of all resources, most of which in construction, and generates more than half of the waste generated from construction and demolition materials. In Germany alone, 54 hectares of green space are sealed every day with new buildings and traffic areas. All of this speaks in favour of the preservation and reuse of existing properties in the sense of a circular economy.3

At the same time, almost all investors now see the risk of stranded assets - i.e. properties that cannot be sold or refinanced due to sustainability or other quality characteristics - as a significant driver for portfolio restructuring. At the same time, this major challenge - namely the careful modernisation or revitalisation of older properties with potential and taking into account their tangible and intangible value - also presents a great opportunity for investors. Regardless of whether it operates under the name “Manage-to-Core”, “Value Add” or “Manage-to-Green”.

 

Three practical examples show possible options

Three concrete case studies from the Commerz Real fund portfolio provide examples of what this means.

Two modern glass buildings stand out in the blue sky.

2 Amsterdam

Starting point: Office property from 1989 in Amsterdam’s Zuidas business district

The challenge: Need for modernisation with regard to ESG, new work and design as well as repositioning as a multi-use concept

Conclusion: The old structure was preserved, upgraded and integrated into a new building, partially transformed into a hotel with skybar, which offers a panoramic view of Amsterdam and became the neighbourhood’s meeting point.

Schäfergasse, Frankfurt am Main

Starting point: vacant office building from 1984 in Frankfurt city centre

The challenge: urgent renovation needs due to age and energy efficiency with conversion of a mediocre office building into urgently needed social housing

Objective: The creation of socially compatible and taxonomy-aligned housing in cooperation with the City of Frankfurt and the Caritas Association as tenants, plus an open meeting café to bring the neighbourhood to life.
A modern, multi-storey building at a street corner with pedestrians and cars in the foreground.
People are walking around a pond with ducks, trees and modern buildings in the background.

Tucherpark, Munich

Starting point: Building complex built from 1967 with offices, hotel, data centre and sports facilities in a green, central location

The challenge: By developing neighbourhoods, we will bring the Tucher Park to life again, while preserving the ensemble character, taking into account individual monuments and harmoniously complementing them with new buildings.

Objective: Creation of an innovative city district with space for living, working and utilities with new public transport connection, preservation of 10 hectares of green space

Renovation should also be recognised financially

“Inventory has value, and we as a company and asset manager need to think about how we can reduce our overall footprint,” Nadia Eichelberger sums up. Deliberate handling of what is present can make a major contribution to this. However, in order for the transformation in the portfolio to continue to accelerate, the existing substance must be valued financially differently. Your suggestion: “The emissions have already been emitted, but avoiding demolition creates a much more positive balance sheet, which could be offset by a CO₂ credit.”

The transformation of the building sector cannot succeed without us taking intensive care of the inventory. This is a great challenge - but also a great opportunity. After all, anyone who looks at supposedly unmarketable existing objects with creativity and without shyness may recognise a visionary new usage concept behind it. Stranded assets can be avoided in most cases. This should also be appreciated more financially.
Nadia Eichelberger
Global Head of Real Estate Office & Industrial at Commerz Real

1https://www.energieforschung.de/de/aktuelles/news/2021/detailansicht/datenbank-schliesst-wissensluecke-ueber-nichtwohngebaeude

2https://www.bundesstiftung-baukultur.de/fileadmin/files/BKB-22/BBK_BKB-22-23.pdf

3BBSR 2020; dena 2021; Destatis 2022