RUECKERCONSULT
The closing panel at Berlin's Real Asset Finance & Debt Summit took its title from the scale of the challenge ahead: "Mammutaufgabe Transformation des Immobilienbestands" — the mammoth task of transforming Germany's existing property stock. An earlier panel had grappled with the consequences of the Zinswende, but this discussion took on an equally uncomfortable truth: Germany's real estate stock needs a fundamental energy overhaul, the economics of doing so barely stack up, and the industry knows it. The question is whether knowing it is enough.
Fritz Roth of Praeclarus Invest moderated a panel bringing together Marcus Buder, Head of Commercial Property Finance at Berliner Sparkasse; Bernhard Visker, Managing Director of B&L Real Estate; and Patrick Otto, Managing Director and Head of Real Estate Germany West at HypoVereinsbank, a member of UniCredit. The result was one of the more candid exchanges of the day.
ESG fatigue — and why it's dangerous
Otto opened with a pointed observation. Two or three years ago, ESG dominated conference agendas — half-day sessions, endless panel discussions, a relentless drumbeat of regulation and ambition. Lately? Almost nothing. "I can't remember discussing ESG at a single event in the past twelve months," he said. The topic, he was clear, has not gone away. The regulatory framework is still there, still tightening, still demanding transparency from banks about the carbon profile of their loan books. The market's collective amnesia on the subject is not a resolution. It is a risk.
Buder was equally direct about the pressure banks are under. The supervisory machinery has moved well beyond general exhortation. Banks are now being asked to define their Ambitionsniveau for improving the energy efficiency of their loan portfolios over time. Risk control departments are adjusting strategies accordingly, and properties above certain CO2 consumption thresholds are simply falling out of what banks will finance. "We have become," said Buder with dry precision, "more the deputy sheriff of the regulator — and we deal with our customers accordingly."
The green premium: myth or reality?
For years the industry assumed that green buildings would command cheaper financing. The reality, the panel agreed, is considerably more complicated. Visker was blunt. Despite having structured nearly €500 million in project development financing in the past year, completed before the Basel rules tighten in 2032, he has never seen a financing cost that genuinely reflected a green premium in his cashflow plan. It really comes down to one question, he said: do I get the financing or not?
Otto was more nuanced. There were a few basis points of incentive in the early years, as banks quietly used green credentials to sharpen pricing while improving their portfolio mix. But everyone knew it wouldn't last. "We always knew it would reverse," he said, "and that having a brown asset would eventually mean paying more." That moment has now arrived. The direction of travel is no longer towards a green discount but towards a brown penalty, and at some point, he added carefully, a brown asset may simply no longer be financeable at all.
Planning, sequencing — and the limits of Förderung
If there was a single practical message from the panel, it was this: start your renovation planning early. Very early. Visker was emphatic — at least two years before the first measure is implemented. The bottleneck is not money or will, but specialists, lead times, and the process of securing grid connections. He described cases where a planned rooftop extension had been delayed by two years simply because the local network operator could not deliver a district heating connection on schedule. Banks, Buder confirmed, are increasingly treating retrofit financing like project development, drawing down funds in tranches as specific measures are completed and verified.
Otto's sharpest moment came when describing the transformation plans now arriving on bankers' desks. Some, he said, are clearly the product of a well-crafted ChatGPT prompt rather than genuine technical and financial planning. "Manches davon hat so ein bisschen was von Hokus-Pokus" — some of it has a whiff of hocus-pocus about it. Banks, he was clear, are not fooled. Trust is the deciding factor.
On whether green renovation of existing stock is economically viable without subsidy support, the panel was unanimous: it is not. Visker laid out the arithmetic plainly. Over a typical investment horizon of five to seven years, additional rental income after an energy renovation does not cover the capital costs of undertaking it. The Wüest & Partner analysis cited by Otto confirmed the picture — moving five energy efficiency classes adds roughly €1 per square metre per month in residential rent and €1.50 in office. Against renovation costs running to tens of millions on larger assets, the sums simply do not work without support. Federal BAFA subsidies cover up to 20% for individual measures; Berlin adds a further 15%. But Visker had a pointed warning: subsidy programmes must be reliable. If a borrower begins planning two years in advance and the government then withdraws support before implementation, the entire business case collapses.
Can we get there?
Roth's closing question cut to the heart of the matter: what about structurally weak regions? Visker's answer was brief and unflinching. "Er wird nicht saniert" — it will not be renovated. At €6 per square metre in parts of Brandenburg beyond Berlin's commuter belt, a renovation business case simply cannot be made to work. Germany, he said, will see a brutal widening of the gap between metropolitan and rural property markets, accelerated sharply by the energy transformation.
On the broader question of whether Germany will actually manage its property transformation, the panel found qualified optimism. Visker noted that construction capacity, hopelessly overloaded a few years ago, is beginning to ease. Otto argued that no one has any choice, pointing to renewed energy vulnerability exposed by the latest Middle East tensions as a reminder of Germany's dependence. His prescription: pragmatism over ideology, with CO2 as the only metric that matters.
Buder was honest about timelines. Climate neutrality for Berlin's building stock by 2045? "I cannot see that happening — not a chance." Achievable in perhaps ten years longer? Probably. "We all actually want this," he said, "even if it sometimes gets pushed into the background by other pressures. At the end of the day, we want to shape a future with as little CO2 as possible for our children." It was, as Fritz Roth noted, a good closing line.