For 40 years, Los Angeles' building code has required all buildings 75 feet and taller to have a rooftop emergency helicopter landing facility in a location approved by the fire chief.
40年来，洛杉矶的建筑条例一直要求，所有75英尺以上的建筑，要在消防部门批准的位置设置紧急直升机降落设施。
For 40 years, Los Angeles' building code has required all buildings 75 feet and taller to have a rooftop emergency helicopter landing facility in a location approved by the fire chief.
40年来，洛杉矶的建筑条例一直要求，所有75英尺以上的建筑，要在消防部门批准的位置设置紧急直升机降落设施。
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