求翻译：本工程为牡丹江建筑设计院中科建筑公司开发建设的牡丹江市宁安县交通局办公楼工程，具体位置见平面图，本工程耐久年限为三级，设计使用年限为50年，建筑高度23.850米，建筑面积为3393.33平方米，本工程抗震设防裂度为六度，结构抗震等级为三级，办公楼共六层，室内外高差0.450m，耐火等级为二级。是什么意思？

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