The amounts pale next to the $50 billion fraud that another high-profile New York figure, Bernard L. Madoff, was accused last week of orchestrating, but they have unnerved lawyers and their clients in the broader legal community.

As the Dreier firm’s lawyers rummage through the law firm’s books, which had been until recently Mr. Dreier’s exclusive preserve, they are finding that bills have not been paid in months. Their health insurance is in default and the firm will not be able to make its $2.6 million payroll on Monday, lawyers there say.

“No one is in charge,” Vincent F. Pitta, a lawyer at the firm, complained last week in an affidavit in support of a government request to freeze assets. “The news of Mr. Dreier’s arrest has had a neutron-bomb-like effect on Dreier L.L.P.”

Few have fallen as quickly as Mr. Dreier, a Yale graduate and Harvard-educated lawyer who had been a partner at some of New York’s better known firms before opening up a high-profile practice of his own in 1996 that now has offices in five cities.

“He promised lavish salaries and lavish compensation and he was attracting the best and the brightest,” said Gerald L. Shargel, Mr. Dreier’s lawyer. Mr. Shargel said Mr. Dreier is cooperating with the receiver now running the firm.

The expense of running such an operation does not provide a ready explanation for thefts of such magnitude. Even the cost of sustaining Mr. Dreier’s appetite for luxury does not provide an easy answer for what instilled the desperation that seems to have prompted schemes involved here, schemes that prosecutors said involved Mr. Dreier pretending to be other people.

Mr. Dreier’s lifestyle includes a waterfront home in the Hamptons, a Manhattan triplex and a place on Ocean Avenue in Santa Monica, Calif. He kept a Mercedes 500 in New York, an Aston Martin in California, and a 121-foot blue and white Heesen motor yacht with a Jacuzzi and a crew of 10 docked in Manhattan or St. Maarten. Associates said the boat, the Seascape, was the site of late-night parties at which Mr. Dreier, who is divorced, was often joined by an attractive young crowd.