There is no 1.4 billion won transaction for Heukseok Mark Hills.jpg

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Type A

This is Type B
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First of all, there is no 85-pyeong unit as mentioned in the article; there are three types: 71-pyeong, 83-pyeong Type A, and 83-pyeong Type B.
Looking at actual transaction records, there is no record of a 1.4 billion won transaction in 2015.
Since the most recent transaction was 5.7 billion won for a 9th-floor unit in '24, the current market price seems to be around 7 billion won.
Given that a 10th-floor unit was 2.4 billion won in 2013,
it has risen about 3 times.
The 10 billion won market price mentioned in the article likely refers to a penthouse listing priced at 10.5 billion won, and since that is a penthouse...
Of course, that celebrity might own a penthouse, but still,
the claim of a 1.4 billion won sale in 2015 makes no sense; even in 2010, a standard floor unit was 2.3 billion won.