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These days, this sound can be replicated by a digital recording played through loudspeakers but Mr Kerr argues that mechanical wailing sirens, which have been manufactured since at least 1905, are proven, reliable and nearly maintenance-free.

Frey wrote in 1988 that he and Kocher “had been discussing the need for low-cost housing in those Depression years. We thought that a small, single-family house, using the new methods of prefabrication and maintenance-free materials, would be both popular with visitors to the Exposition and offer a solution for the housing shortage of the times.”

Although a well-designed and properly installed irrigation system should be relatively low maintenance, it is not maintenance-free.

"You might not even have the luxury of sending out a technician to replace a battery. Instead, our system is maintenance-free. It harvests energy and operates itself," Monagle adds.

In addition to its location in a highly appealing and walkable neighborhood, Mirabella boasts a maintenance-free lifestyle.