Phoenix, Arizona, enacted a zoning regulation that new homes use Spanish tile roofs—an ornate touch that adds up to $6,000 to new home prices. Coral Gables, Florida, requires Spanish tile roofs on any children's playhouses in families' backyards. Local governments have even invoked zoning codes to require builders of apartment buildings to install whirlpool tubs and special electric ranges (in one case identified by brand name).

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