Luxury negotiation is quieter and slower than the rest of the market. Sellers at this level are rarely desperate. A property can sit for months not because something is wrong with it but because the seller is waiting for one specific buyer. Misreading that patience as weakness produces offers that go unanswered.
Leverage comes from information. What the building or street has actually closed at. How long the property has been exposed. What the seller's situation is, when it can be learned. An offer built on that record, presented seriously, gets engagement that a lowball never will.
Price is also only one lever. Closing timeline, deposit size, contingencies, furniture, and leaseback terms all carry value, and a buyer flexible on terms can often win on price. This is where an experienced agent earns their place. Rangely negotiates with the numbers assembled first, in English or Spanish, on either coast of the deal.