Negotiation as Expected Value

From the sensitivity table: €8,900 off (5%) is worth about +1.9pp of ten-year IRR – roughly €12,000 of extra year-10 equity. It is the highest-return hour in the entire process, and most first-time buyers skip it because asking feels rude.

Price the ask. You offer €169,000 against €178,000. Plausibly: 40% they accept, 35% you settle around €173,500, 25% they hold firm. Note what is not on the list – "they storm off and blacklist you." A seller holding a financed, ready buyer does not throw that away over an opening offer.

EV of asking ≈ 0.40 × €9,000 + 0.35 × €4,500 + 0.25 × €0 = €5,175, against a downside close to zero – provided your second-best deal is alive.

That proviso is the whole article. Your BATNA is not an attitude, it is a specific other flat you have viewed, priced and could bid on this week. Without one, your reservation price silently becomes whatever the seller asks, and you will find this out in the notary's office. Keep two alive. Never reveal which you prefer. Yes, maintaining a second candidate costs weekends you would rather not spend – those weekends are the negotiating budget.

What actually creates leverage in a German transaction, in descending order of what sellers care about:

1. A written Finanzierungsbestätigung. Certainty beats price. A seller whose last buyer collapsed at the bank will pay real money for it.
2. Speed and flexibility on the Notartermin and the Nutzen-Lasten-Wechsel date.
3. Willingness to take the sitting tenant, which roughly halves the seller's buyer pool.
4. Documented defects, itemised in euros. Not "the building is old," but: "Beschluss of 14.03.2026, façade, our share €4,200; Rücklage €11/m² against a €25/m² benchmark; boiler from 2004." An itemised anchor is stickier than a round percentage and far less insulting – it moves the conversation from taste to arithmetic, where you are better.
5. Silence. Put the offer in writing, give one reason, stop talking.

What creates none: telling them you love it; explaining your budget; a heartfelt letter; the word "flexible."

One rule. Decide your maximum before the first conversation, write it down, and hand the number to your partner with authority to enforce it. In the room you are not a rational agent. You are a person who has spent six Saturdays on this.