The glass was then — I'll use the word impregnated — but it had a layer of metal that was called "stretched metal." That metal acts as a microlouver, so from the exterior of the building, the sun sees it as totally opaque, but from the interior, it's entirely transparent.
Металл действует как микрожалюзи — снаружи здание полностью закрыто от солнца, но если вы посмотрите изнутри здания, то окна будут прозрачными.