Anyone scanning Disney Hall’s debut calendar in the fall of 2003 would have noticed the size of that first season’s schedule, 128 shows in all. That’s a weighty number for a new hall—one might have assumed it was chosen by venue management wanting the gravitas of a world-class chamber’s arrival or perhaps seeking a broad spectrum of music that could reflect the diverse city. Those guesses would have been wrong. Disney Hall had been built atop Parcel K, a county-owned square of land on Bunker Hill that long had sat empty, awaiting development. For decades Parcel K served a prosaic function: It was a parking lot. Commercial landowners like parking lots; they generate cash until better economic conditions arrive, and blank space can be converted into a more profitable moneymaking device—typically a building. The practice is called “land banking.”

Yet before an auditorium could be raised on K, a six-floor subterranean garage capable of holding 2,188 cars needed to be sunk below it at a cost of $110 million—money raised from county bonds. Parking spaces can be amazingly expensive to fabricate. In aboveground structures they cost as much as $40,000 apiece. Belowground, all that excavating and shoring may run a developer $140,000 per space. The debt on Disney Hall’s garage would have to be paid off for decades to come, and as it turned out, a minimum schedule of 128 annual shows would be enough to cover the bill. The figure “128” was even written into the L.A. Philharmonic’s lease. In 2003, Esa-Pekka Salonen opened Frank Gehry’s masterpiece to a packed house with Mahler’s Resurrection, and in the years since, concertgoers—who lay out $9 to enter the garage—have steadily funded performances that exist to cover the true price of their parking.

Donald Shoup, a Yale-trained economist and former chair of UCLA’s Department of Urban Planning, loves telling this story. Gehry’s auditorium may be wonderful, says Shoup, but it is also a f...