NEW YORK, JUNE 20 -- Four foreign banks, three from Japan and one from West Germany, now hold in their hands the immediate financial fate of struggling real estate developer Donald J. Trump, banking sources said today.

The four banks so far are the only holdouts among dozens that have been working to put together a deal that would help Trump out of his current cash squeeze and buy him enough time to sell off assets, cut costs and boost revenue, the sources said.

More than 50 other U.S. and foreign banks have reached a tentative accord with Trump, and among themselves, on the deal that would give Trump $65 million in fresh cash, bankers said. But the four foreign banks -- which hold the mortgage on Fifth Avenue's Trump Tower, one of Trump's few money-making properties -- are still in a position to derail the pact.

The four foreign banks have balked so far because the agreement provides for other banks to obtain a second mortgage on the Trump Tower, thereby diluting the four holdouts' stake.

"The Trump Tower banks are not in place. The foreign banks in that syndicate seem to be balking," said a banker close to the negotiations. "If they don't go along, the deal will not go through," said the executive, who spoke on condition of remaining unidentified.

The banker identified the four lenders as Mitsubishi Bank, Sumitomo Bank, Dai-Ichi Kangyo Bank and Dresdner Bank. It was not immediately possible to obtain comment from them.

The proposed deal would not only provide Trump with $65 million in new cash but would also grant him a moratorium on paying interest on a portion of $2 billion in bank debt, bankers said. In return, Trump would provide as collateral a significant portion of his casino, real estate and airline holdings, and would agree to raise cash by selling some major assets, they said.

Trump also has agreed to hire one or more new executives to take control of his financial operations, in recognition that he has done an inadequate job of holding down expenses, the bankers said.

Chase Manhattan Corp., the U.S. bank holding company that is one of Trump's four principal lenders, plans on Thursday to strongly urge the four recalcitrant foreign banks to go along with the deal, banking sources said.

Chase heads the syndicate that includes the four foreign banks. Together, they share the $75 million mortgage on the Trump Tower. Chase holds a bit more than $15 million of the loan, and the four foreign banks share equally in a bit less than $60 million of it.