Gawker Media founder Nick Denton filed for personal bankruptcy in August after his company was hit with a $140 million invasion of privacy judgment; a later effort to rent his Manhattan apartment was denied by a bankruptcy judge. Now Mr. Denton is putting his condo on the market for $4.25 million, according to court documents.

Mr. Denton bought the loft in New York’s Soho neighborhood in 2004 for $1.87 million, according to property records. Mr. Denton said he owes $1.73 million on his mortgage, with a monthly payment of $14,985,...