General Growth Properties, the mall owner at risk of bankruptcy, received offers of almost $400 million for properties including Boston’s Faneuil Hall and New York’s South Street Seaport, according to a person familiar with the matter.

The properties – including Harborplace & the Gallery in Baltimore – were put on the block in December. More than 10 offers were received, including offers for the entire portfolio and for individual properties, said the person, who asked not to be identified because the sales process isn’t public.

General Growth is negotiating with lenders and selling real estate to remain solvent. The company last week said it has $1.18 billion in past-due debt, and warned again it may be forced into bankruptcy.

The person familiar with the sale wouldn’t identify the bidders, which include private groups, buyers from overseas and real-estate developers. The highest bids for each property total almost $400 million, the person said.

General Growth spokesman Tim Goebel declined to comment.