The company was still calculating the exact percentage of shares that voted, spokeswoman Kathy Shepard said.
Under terms of the buyout, Blackstone will pay Hilton shareholders $47.50 per share in cash. Including assumed debt, the total deal is valued at $26 billion (18.75 billion EUR).
Shares of Hilton Hotels rose 14 cents to $46.12 during afternoon trading. Blackstone Group shares rose 23 cents to $23.88.
The transaction must still pass regulatory approval.
Beverly Hills-based Hilton Hotels operates more than 2,800 hotels around the world. The company generated $8.11 billion (5.85 billion EUR) in revenue last year.
The head of Russian Technologies, Sergei Chemezov, clarified the fate of anti-aircraft guided missiles that Russia was supposed to deliver to China
About 95% of Putin's Address to the Federal Assembly was devoted to social issues, but he also spoke about Russia's military power, her state-of-the-art weapons, and did not miss a chance to intimidate the United States.
The Basmanny Court of Moscow arrested Michael Calvey, the founder of Baring Vostok investment fund, on allegations of embezzling 2.5 billion rubles from Vostochny Bank. Calvey will be held in custody until April 13