ive . ▁All ▁dec isions ▁are ▁made ▁by ▁the ▁own ers , ▁who ▁have ▁deleg ated ▁minor ▁day - to - day ▁operations ▁to ▁Corn wall ▁Park ▁Trust . ▁Corn wall ▁Park ▁is ▁a ▁private ▁park , ▁also ▁open ▁to ▁the ▁public , ▁admin ister ed ▁by ▁the ▁Corn wall ▁Park ▁Trust ▁Board . ▁The ▁Trust ' s ▁end ow ment ▁includes ▁income ▁from ▁le ase hold ▁properties ▁ad jo ining ▁the ▁park ' s ▁borders . ▁ ▁Because ▁One ▁Tree ▁Hill ▁Domain ▁is ▁high ▁and ▁relatively ▁central , ▁the ▁city ▁has ▁long ▁used ▁it ▁for ▁its ▁pot able ▁water ▁res er voir s . ▁The ▁first ▁of ▁these ▁was ▁constructed ▁in ▁ 1 9 0 0 ▁at op ▁the ▁western ▁peak ; ▁though ▁it ▁is ▁no ▁longer ▁in ▁service , ▁the ▁small ▁structure ▁remains ▁in ▁place . ▁Five ▁further ▁res er voir s ▁were ▁subsequently ▁built ▁under ground , ▁with ▁the ▁latest ▁completed ▁in ▁ 1 9 7 7 . ▁They ▁are ▁currently ▁used ▁to ▁maintain ▁supply ▁to ▁the ▁One hung a ▁area ▁and ▁to ▁the ▁res er voir s ▁at op ▁Ma ung a wh au ▁/ ▁Mount ▁E den . ▁ ▁Corn wall ▁Park ▁▁ ▁Corn wall ▁Park , ▁which ▁ad jo ins ▁the ▁domain , ▁was ▁given ▁by ▁Sir ▁John ▁Log an ▁Campbell ▁to ▁a ▁private ▁trust ▁he ▁had ▁established ▁to ▁hold ▁the ▁land ▁for ▁the ▁use ▁of ▁the ▁public . ▁ ▁Tre aty ▁settlement ▁In ▁the ▁ 2 0 1 4 ▁Tre aty ▁of ▁Wait ang i ▁settlement