"Community consultation on plans for the new build provided plenty of feedback that we must make sure Benjamin is provided for."
Athfield Architects was asked to do a concept design for the building in a tender process in which the entry must cater for a "contented tabby cat curled up inside the new building".
The identity of the design companies was kept from decision-makers.
"Ath was a passionate supporter of libraries, believing in the power that knowledge and learning offers to people.
"He was involved in reviewing that first concept design and handed the remainder of the project over to his talented team here in Auckland."
They included a cat door in the staff workroom door for Benjamin.
The door, which cost "a few hundred dollars" is programmed to Benjamin's microchip so only he can use it.
"During the day, Benjamin can come and go as he pleases.
"At night time he will only have access to the staff workroom, via his cat door."