NEW YORK — The Roman Catholic Archdiocese of New York said Monday that it was raising at least $300 million as it moved to negotiate a settlement that would benefit roughly 1,300 people who have said they were sexually abused as minors by its priests and lay staff members.

The archdiocese said it had agreed with representatives of the accusers on a mediator and had begun to raise money by cutting costs and selling assets, including its headquarters and other real estate.

Jeff Anderson, a lawyer who represents 300 people who have filed abuse claims against the archdiocese, said Monday that the archdiocese had taken “a step in the right direction,” but cautioned that the matter was far from settled.

“There is no agreement at all — what we do have is a proposal for a process by which you g

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