Logan, a 53-year-old investment banker, leads a tour of his house in the Marin County town of Tiburon, perched above the San Francisco Bay. The eclectically furnished, art-packed living room sets the tone. On one side of the room, Untitled (Venus/The Great Circle) by Jean-Michel Basquiat hangs catercorner to David Park's brooding canvas The Bathers. Across the way, Andy Warhol's Double Jackie faces off against The Room, a whimsical Philip Guston. There's a ravishing, newly purchased early Hockney, Seated Woman Being Served Tea, in the dining room, and looming above a stairwell is Gottfried Helnwein's powerful Untitled (Child).