Last July, the council's former chief executive, Doug McKay, said the council had planned to have its fit-out and upgrade judged under the Green Star rating scheme of the Green Building Council, and the changes marked an important opportunity to transform the building and set the standard for others.
The council spokesman said a leak on level 23 was due to a minor split in the silicon sealant around a double-glazed window unit. The split allowed water to enter a localised area after heavy rainfall this month.
"The issue is minor and can occur to any modern window unit. It is avoided on all buildings by conducting regular inspections, when the sealant is checked and replenished where necessary. The window sealants for 135 Albert St are checked during scheduled window cleaning.
"The refurbishment of 135 Albert St requires the erection of exterior scaffolding and swinging-stage work. For obvious health and safety reasons, the regular window cleaning schedule [is] on hold and this means some window sealant inspections have been deferred for a short time," the spokesman said.
"During this time there was a risk some sealants could split without being resealed, resulting in minor water intrusion. With the scaffolding now removed, the regular maintenance schedule has recommenced."