▁structure ▁placed ▁in ▁front ▁of ▁the ▁Douglas ▁Ann and ▁m ural ; ▁ ▁a ▁wooden ▁en closure ▁around ▁the ▁spir al ▁st air case ; ▁ ▁a ▁ne on ▁light ▁attached ▁to ▁the ▁wooden ▁en closure ▁around ▁the ▁spir al ▁st air case ; ▁and ▁ ▁a ▁glass ▁covered ▁show case ▁below ▁the ▁spir al ▁st air case . ▁ ▁The ▁Commission er ▁of ▁In qu iry , ▁William ▁Sim pson , ▁found ▁in ▁October ▁ 1 9 8 8 ▁in ▁favour ▁of ▁u ph old ing ▁the ▁making ▁of ▁the ▁P CO . ▁ ▁The ▁alter ations ▁were ▁subsequently ▁removed . ▁ ▁Description ▁ ▁The ▁building ▁compr ises ▁a ▁bas ement ▁for ▁par king ▁and ▁ground , ▁me zz an ine ▁and ▁four ▁upper ▁flo ors ▁for ▁office ▁accommod ation . ▁ ▁A ▁further ▁two ▁upper ▁flo ors ▁were ▁for ▁the ▁installation ▁of ▁the ▁air ▁condition ing ▁plant ▁and ▁other ▁services . ▁ ▁Str ucture ▁and ▁services ▁The ▁building ▁is ▁a ▁steel ▁column ▁frame . ▁ ▁The ▁flo ors ▁are ▁constructed ▁in ▁a ▁rein for ced ▁concrete ▁rib bed ▁system ▁with ▁clear ▁sp ans ▁of ▁. ▁ ▁The ▁building ▁incorpor ates ▁a ▁cur tain ▁wall ▁( set ▁back ▁ ▁from ▁the ▁building ▁line ) ▁of ▁an od ised ▁al umin ium ▁members ▁with ▁sp and rel ▁pan els ▁of ▁n avy ▁blue ▁col oured ▁cer am ic ▁glass . ▁ ▁All ▁the ▁gla zing ▁( in ▁pan els ▁meas uring ▁ ▁wide ▁by ▁ ▁high ) ▁is ▁fixed ▁except ▁for ▁one ▁sl