The appellants appealed the supplementary assessment of their property for the 2017 taxation year under section 34 of the Assessment Act.
The property, formerly vacant land, had a newly built detached raised bungalow.
MPAC assessed the current value at $962,000, representing a supplementary increase of $705,000.
The appellants argued the current value should be between $750,000 and $800,000 based on their comparable properties.
The Assessment Review Board found the appellants' comparable properties to be inferior in age and requiring too many adjustments.
The Board accepted MPAC's evidence, finding that the correct current value was at least $962,000, and confirmed the supplementary increase of $705,000.