The Florida real estate blog Condo Vultures says downtown Miami's last residential construction crane has disappeared. At the height of Miami's building boom, up to 40 cranes hovered over residential construction projects. They built dozens of buildings with thousands of condos. But now real estate prices have fallen. The last of the cranes that put up those buildings have been disassembled. They've been hauled off on flatbed trucks â€” migrating like giant birds to wherever business is better.