The current financing on the Fifth Avenue building is about $240 million.
Property & Building, the real estate subsidiary of holding company IDB (IDBH.TA), said the new agreement would generate cash flow of about $150 million.
It bought the building two years ago for around $350 million.
Last month, the company said it had signed a non-binding term sheet with a foreign bank to refinance its borrowing on the building.
Property & Building's shares were up 1.5 percent in late morning trade in Tel Aviv. Its bond prices were up 0.6 to 0.7 percent.
(Reporting by Steven Scheer)
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