Sean Combs is living in the same unit of a Brooklyn jail as Sam Bankman-Fried, the crypto mogul convicted of fraud, sleeping in a dormitory-style room with a group of other defendants assigned to the same section, according to a person familiar with the living arrangements.

Mr. Combs has been held in the jail, the Metropolitan Detention Center, for nearly a week, since federal prosecutors unsealed an indictment charging him with racketeering conspiracy and sex trafficking in what the government has called a “decades-long pattern of physical and sexual violence.”

He has pleaded not guilty to all charges, and his lawyers argued strenuously for him to be released on bail, proposing to a judge that he put up a $50 million bond and hire a security team to monitor him at all hours. The judge rejected the proposal, saying that he had concerns about Mr. Combs attempting to witness tamper, landing him in a special housing unit that often holds high-profile inmates.

A spokeswoman for the Bureau of Prisons said the agency “does not provide information about conditions of confinement, including housing assignments or internal security practices for any particular incarcerated individual.”

Mr. Bankman-Fried has been housed in the jail, known as M.D.C., since last year, when his bail was revoked after a judge ruled that he had violated conditions of his release. In the lead-up to his trial, his lawyers complained that he had only intermittent internet access and could not adequately prepare for his case. They said that Mr. Bankman-Fried, a vegan, was subsisting on a diet of water, bread and peanut butter.

Mr. Bankman-Fried, who founded the FTX cryptocurrency exchange, was convicted of masterminding a sweeping fraud in which he siphoned billions of dollars of his customers’ money into venture capital investments, political contributions and other lavish spending. He was sentenced to 25 years in prison.

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