"Infratil and the Super Fund bought the downstream assets of Shell New Zealand, rebranding the petrol station chain into Z Energy and later listed the company on the stock market, and more recently jointly took separate cornerstone stakes in local retirement village operator and developer Metlifecare.
The RetireAustralia investment will be managed by Infratil's manager HRL Morrison & Co, which has held an investment mandate with the Super Fund since 2006.
Infratil affirmed its guidance for March 2015 earnings before interest, tax, depreciation, amortisation and fair value adjustments at between $475 million and $500 million, with the transaction increasing forecast net interest to a range of $170 million and $180 million from $165 million to $175 million.
The investment firm said the acquisition will increase its asset allocation to growth infrastructure as it rejigs its portfolio for the next round of long-term returns, with the retirement sector "developing as an emerging line of business for Infratil with significant opportunities to deploy capital in the future."
The sale price includes estimated transaction costs of A$23.5 million. RetireAustraila is currently owned by Morgan Stanley Real Estate Investment and the JP Morgan Global Special Opportunities Group.
Shares of Infratil last traded at $3.03 and have climbed 42 percent this year, outpacing the 17 percent gain in the benchmark NZX 50 Index over the same period.