ROSELANDS was less than a year old before its size was surpassed. BANKSTOWN SQUARE, another Sydneyside shopping precinct, began trading to the public in September 1966. This complex encompassed an astounding (for the time) 755,000 lettable square feet; which was 102,600 larger than ROSELANDS. 
Photo from The State Library of New South Wales / Australian Photographic Agency 24410 / Mitchell Library

Graphic from the Lend Lease Development Propriety Limited Company