, ▁with ▁The ▁En viron ments ▁Group ▁providing ▁the ▁interior ▁space ▁design ▁and ▁construction . ▁ ▁US G ▁entered ▁a ▁ 1 5 - year ▁le ase , ▁and ▁occupied ▁the ▁building ▁in ▁early ▁ 2 0 0 7 . ▁ ▁The ▁new ▁building ▁is ▁occupied ▁ 6 5 % ▁by ▁US G ▁and ▁ 1 0 % ▁by ▁Hum ana ▁Inc . ▁ ▁As ▁an ▁in cent ive ▁for ▁US G ▁to ▁remain ▁in ▁the ▁dow nt own ▁Chicago ▁area , ▁the ▁city ▁of ▁Chicago ▁created ▁a ▁re development ▁agreement ▁that ▁contributed ▁$ 6 . 5 ▁million ▁to ▁the ▁construction ▁of ▁the ▁new ▁building . ▁ ▁In ▁turn , ▁US G ▁agreed ▁to ▁maintain ▁at ▁least ▁ 5 0 0 ▁full - time ▁equivalent ▁jobs ▁at ▁all ▁times ▁for ▁a ▁period ▁of ▁ten ▁years ▁at ▁the ▁new ▁corpor ate ▁headquarters . ▁ ▁Man ufact uring ▁and ▁min ing ▁facilities ▁Gy psum ▁wall board ▁manufact uring ▁facilities ▁are ▁reported ▁to ▁the ▁SE C ▁based ▁on ▁the ▁extent ▁to ▁which ▁the ▁gy psum ▁they ▁use ▁comes ▁from ▁synth etic ▁or ▁natural ▁sources . ▁ ▁Pl aster ▁City , ▁California ▁facility ▁US G ▁has ▁a ▁large ▁gy psum ▁plant ▁located ▁ ▁west ▁of ▁El ▁Centro , ▁California , ▁along ▁highway ▁Inter state ▁ 8 , ▁at ▁Pl aster ▁City . ▁The ▁Pl aster ▁City ▁location ▁makes ▁She et rock ▁brand ▁gy psum ▁pan els . ▁The ▁gy psum ▁is ▁m ined ▁from ▁a ▁quar ry ▁located ▁ ▁to ▁the ▁north , ▁in ▁the ▁Fish ▁Creek