s ▁– ▁Sub st ant ial ▁improvements ▁were ▁made ▁to ▁the ▁estate ▁by ▁George ▁Black ett ▁including ▁a ▁fl our ▁mill ▁( the ▁Col ling wood ▁Fl our ▁Mill ) ▁near ▁the ▁Georges ▁River . ▁▁ 1 8 4 5 ▁– ▁It ▁is ▁thought ▁that ▁another ▁room ▁was ▁added ▁by ▁George ▁Black ett ▁to ▁the ▁south ▁western ▁corner ▁of ▁the ▁house ▁prior ▁to ▁ 1 8 4 5 . ▁▁ 1 8 5 6 ▁– ▁Due ▁to ▁the ▁proxim ity ▁of ▁the ▁Col ling wood ▁Est ate ▁to ▁the ▁new ▁railway ▁linking ▁Par ram atta ▁and ▁Liverpool ▁new ▁indust ries ▁were ▁developed ▁around ▁and ▁on ▁the ▁estate . ▁James ▁Henry ▁At kin son ▁developed ▁the ▁Col ling wood ▁Est ate ▁as ▁a ▁dep ot ▁for ▁the ▁transfer ▁of ▁past oral ▁and ▁agricult ural ▁produce . ▁He ▁built ▁a ▁private ▁railway ▁s iding , ▁large ▁railway ▁store , ▁an ▁ab atto ir , ▁stock ▁and ▁sale ▁yards , ▁a ▁w ool ▁was h , ▁F ell m ong ery ▁and ▁paper ▁mill . ▁At kin son ▁also ▁built ▁a ▁series ▁of ▁terra ce ▁like ▁workers ▁c ott ages ▁in ▁Nag le ▁Street ▁( then ▁Col ling wood ▁Street ). ▁▁ 1 8 5 7 ▁– ▁Col ling wood ▁House ▁was ▁renov ated ▁by ▁the ▁Arch itect ▁William ▁We aver . ▁A ▁second ▁store y ▁and ▁ver and ah s ▁were ▁added , ▁and ▁a ▁new ▁kitchen ▁block ▁built . ▁▁ 1 8 5 9 ▁– ▁The ▁Col ling wood ▁Est ate ▁was ▁sub div