Ngati Whatua o Orakei Maori Trust Board won an arbitration two years ago to set higher valuations for the land, which meant leaseholders - such as apartment owners - must pay landowners Kupe Trust much higher rents.
She now has to pay $6215 in annual ground rent, up from $1300 - a rise of 378 per cent.
The operating expenses levy had also nearly doubled from $2814 to $5310.