Greece and its private sector creditors remain mired in deep negotiations over a deal to reduce the nation’s crushing debt load.

Institute of International Finance director Charles Dallara, who represents the private sector investors and banks that hold Greek debt, said “it’s not entirely clear” how close the parties are to a deal.

“I wouldn’t say I’m confident, but I’m hopeful we’ll reach agreement,” Dallara told CNN International’s Richard Quest in a phone interview from Athens.

The talks ended Wednesday without an agreement. They will resume Thursday and Dallara said final terms could be reached in the days ahead.

The IIF has been in discussions with the Greek government over an agreement to voluntarily write down the value of Greek government bonds by 50%.

The private sector holds over EUR200 billion worth of Greece’s total debt load — estimated at EUR350 billion.

Dallara said the group intends to follow through on the 50% writedown, which was announced following a summit of European Union leaders in December.

That would result in significant losses for the private sector. But it would also help reduce Greece’s debt load to 120% of economic output by 2020.

In addition, Dallara said 15% of the remaining amount that Greece owes the private sector would be paid in cash. Another 35% would be restructured, or replaced with loans that have longer maturities and lower interest rates.

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