The house had also been extensively renovated by previous owners and, for a decade prior, had been home to a family of five. According to real estate documents the sale settled last month and the property is mortgage-free. The unusual debt-free purchase, in the hottest city in a country which ratings agency Fitch this week said was the most expensive housing market in the world, was made possible by the staggering success of Yelich-O'Connor's album Pure Heroine.
A Herald analysis of sales and streaming numbers conducted in December 2014 suggested - after her song-writing partner, then-manager and record label took their cuts - Yelich-O'Connor had earned over $11 million from Pure Heroine.
Gross revenues from the sales of physical and electronic copies of songs from the album - which are also split with retailers, labels, Apple and the taxman - was close to $100 million. In the year since she turned 18, becoming legally able to take direct control of her business affairs, she has become a director of companies managing her assets and split from manager Scott MacLachlan.
She still remains free of a manager - and the typical manager's 20 per cent cut of her income.
Questions to the singer about the purchase and future music and investment plans, sent through her record label Universal Music NZ, were met with a polite "no comment".
Last year she returned to the studio to begin work on her second album.