UPDATE 2-Deutsche Bank to sell Macklowe buildings-source

(Adds confirmation on Shorenstein)

NEW YORK, June 10 (Reuters) - Deutsche Bank (DBKGn.DE) plans to sell some buildings it took back from real estate company Macklowe, two of them to Shorenstein Properties, according to a source familiar with the matter.

Shorenstein Properties signed a deal to buy a stake in Park Avenue Tower and 850 Third Avenue, said the source, who was not authorized to speak publicly about the sale.

The Wall Street Journal reported on its website on Tuesday that Shorenstein will take a 93 percent stake in the two buildings for about $930 million, while the skyscraper at 1301 Sixth Avenue likely will be bought by Paramount Group Inc, for about $1.45 billion.

The prices are sharply lower than developer Harry Macklowe paid for them, Journal reported, citing people familiar with the matter.

A Deutsche Bank spokesman and representatives for Shorenstein and Paramount did not return telephone calls seeking comment.

The transactions are being watched to gauge where prime Manhattan real estate is pricing in a market in which so few deals are being done, the Journal said.

Deutsche Bank -- as the seller -- is providing debt financing for the distressed properties, the paper also said.

Separately, Italy's Sorgente Group SpA is negotiating to raise its stake in the Flatiron Building to become the largest shareholder, testifying to the strength of the euro and the appeal of landmark property, the Journal reported.

The deal would increase Sorgente's stake from less than one-fifth to about one-half and values the building at $180 million.

Sorgente officials could not be reached. (Reporting by Robert MacMillan; Editing by Gary Hill)