Overview
- The IBB Prüfbericht, published Thursday, concluded the architects' ring‑edge proposal for about 21,400 homes is fundamentally doable and produced detailed cost and revenue figures.
- The report estimates total program costs of roughly €7.88 billion and says a state project company would need about €2 billion in equity to begin construction.
- IBB projects average rents near €16 per square metre and net rental income of about €244 million a year if the entire stock is let, assumptions that depend on low construction costs of €3,800/m² from serial building.
- Major items are excluded from the €7.88 billion figure, notably transport works such as a new S‑Bahn station whose bill would fall to public budgets or the BVG rather than the project company.
- The IBB flags key risks that could change the economics — the need for a single serial‑builder approach, possible soil contamination, and the legal and political barrier that the Tempelhofer Feld law and a prior Volksentscheid would have to be changed — while estimating an €8 billion GDP boost and thousands of temporary jobs if built.