It does sound a lot but that is where the market is, or it may have increased since they purchased.
They were paying $520pw for a tiny 2brm flat, one of four in a converted house, flats attached front and rear and above.
Their place is at least 30% larger and has a basement with full head height and partly concreted, they are one of two units on a 600sqm site. Running a mortgage of $700k @ 6.7%. So interest on mortgage is about $47k pa, plus insurance and rates, say $50k.
They were paying about $27k in rent for less amenity. The extra $23k cost of ownership equates to about 2.8% of the purchase price. We think that over a 5-10 year time frame the property will increase in value at a rate in excess of 2.8%.