▁factor ▁is ▁that ▁among ▁the ▁buildings ▁constructed ▁in ▁Paris ▁during ▁the ▁Second ▁Empire , ▁besides ▁being ▁the ▁most ▁expensive , ▁it ▁has ▁been ▁described ▁as ▁the ▁only ▁one ▁that ▁is ▁" un question ably ▁a ▁master pie ce ▁of ▁the ▁first ▁rank ." ▁This ▁opinion ▁is ▁far ▁from ▁un anim ous ▁however : ▁the ▁ 2 0 th - century ▁French ▁architect ▁Le ▁Cor bus ier ▁once ▁described ▁it ▁as ▁" a ▁lying ▁art " ▁and ▁cont ended ▁that ▁the ▁" G arn ier ▁movement ▁is ▁a ▁dé cor ▁of ▁the ▁grave ". ▁ ▁The ▁Pal ais ▁G arn ier ▁also ▁houses ▁the ▁Bibliothèque - Mus ée ▁de ▁l ' Op éra ▁de ▁Paris ▁( Par is ▁Opera ▁Library - M useum ), ▁which ▁is ▁managed ▁by ▁the ▁Bibliothèque ▁N ationale ▁de ▁France ▁and ▁is ▁included ▁in ▁un ac comp an ied ▁t ours ▁of ▁the ▁Pal ais ▁G arn ier . ▁ ▁Dim ensions ▁and ▁technical ▁details ▁The ▁Pal ais ▁G arn ier ▁is ▁ ▁from ▁ground ▁level ▁to ▁the ▁a pe x ▁of ▁the ▁stage ▁fly t ower ; ▁ ▁to ▁the ▁top ▁of ▁the ▁fac ade . ▁ ▁The ▁building ▁is ▁ ▁long ; ▁ ▁wide ▁at ▁the ▁later al ▁gall eries ; ▁ ▁wide ▁at ▁the ▁east ▁and ▁west ▁pav il ions ; ▁ ▁from ▁ground ▁level ▁to ▁bottom ▁of ▁the ▁c is tern ▁under ▁the ▁stage . ▁ ▁The ▁struct ural ▁system ▁is ▁made ▁of ▁m ason ry ▁walls ; ▁conce aled ▁iron ▁flo ors , ▁v ault