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Sunny Isles Beach

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Karl-Heinz Lachnit and 19575 Collins Avenue

South Florida’s top deals: Investor sells Sunny Isles Beach penthouse for $20M

TRD reports the most important transactions for Wednesday, Feb. 11, 2026

194 South Island Drive in Golden Beach with Saber South's Michael Klinger

South Florida’s top deals: Developer Michael Klinger sells Golden Beach home for $27M

TRD reports the most important transactions for Friday, Jan. 9, 2026

Irving Langer and Johann Graf with Muse Sunny Isles Beach (Getty, Novomatic, Google Maps)

Heir to Austrian billionaire’s fortune buys Sunny Isles penthouse

New York investor Irving Langer sold the unit for less than he paid in 2018

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