exempted structure
免除结构
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Some of that is deferred maintenance, but the bulk derives from the cruel Catch-22 of occupying a historic structure: The Corcoran has been "grandfathered, " or exempted, from various ordinances and codes over the years.
WSJ: Corcoran Gallery of Art | Another Museum Mulls Pulling Up Stakes | By Eric Gibson
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