A German real estate fund has acquired 175 Federal St. in Boston’s Dewey Square from Blackstone’s Equity Office Properties for $139 million, or $611 per square foot.

Deka Immobilien Investment GmbH closed on the purchase Tuesday, according to Suffolk County Registry of Deeds filings. The 17-story, 227,365-square-foot tower completed in 1977 is 92 percent leased to tenants including Fudiciary Trust Co., Bank of America, Adler Pollock & Sheehan, QPID Health and Intercontinental Insurance.

Like most of the class A office towers that have been sold in Boston in recent years, the property attracted widespread interest from foreign institutional investors. Two-thirds of the bidders were overseas investors, according to a source familiar with the transaction.

Another German real estate fund, Union Investment Real Estate GmbH, recently paid $452 million, or $1,027 per square foot, for the new PwC regional headquarters at 101 Seaport Blvd.

That followed Union’s $150 million acquisition in March of the new Converse headquarters at Lovejoy Wharf and its $173.9 million purchase of the 242-room Godfrey Hotel in December.

JLL Boston’s capital markets team represented Blackstone in the 175 Federal St. transaction.

Designed by The Architects Collaborative of Cambridge and developed as a joint venture of Beacon Cos. and Carpenter & Co., the hexagonal tower’s narrow base reflects site constraints related to the MBTA Red Line tunnel, which runs beneath the property.