It marks Blackstone's second deal with a troubled Australian property firm this year, after the buyout giant paid $9.4 billion to Centro Properties for nearly 600 US shopping malls in March.
Blackstone will also take on Valad's liabilities, including almost A$500 million of debt under the deal, according to a report on the Australian newspaper's web site.
Valad, a real estate investment group with an international network of offices managing A$8 billion in 13 countries, is laden with debt with its gearing at 51.3 percent as of December 31, 2010.
Valad said in a statement Blackstone had offered A$1.80 per security. Shares of Valad, which went into a trading halt Thursday, ended at A$1.16 on Wednesday.
The shares rallied 52 percent to A$1.755 on Friday after the deal was announced, in line with the offer price.
Valad's shares had dived during the global financial crisis from a peak of A$49.92 -- implying a market capitalisation of A$3 billion -- to $0.44 at their nadir. It went on a A$2 billion expansion spree in 2007, but struggled to pay off debt.