Since filing for bankruptcy earlier this year, Sears has announced plans to close more than 260 of its 700 or so stores, or more than a third of its locations.
The company informed associates Thursday of the upcoming closures, according to a release posted on the Sears Holdings website.
The 80 stores - comprised of 43 Sears and 37 Kmarts - are due to close by March.
Last week, a bankruptcy court allowed Sears Holdings to sell its home improvement service businesses to Service.com for $60 million.
Robin Lewis, a New York-based retail consultant, questioned whether Lampert is honestly trying to save the business and bring it out of business.
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Failing a successful purchase bid, Sears is facing the possibility of liquidation, ending the company's 125-year run as one of the country's best-known retailers.
Also, Sears is closing 80 more stores.
Sears chairman Eddie Lampert proposed to buy out the company as a whole through his hedge fund, ESL Investments, for $4.6 billion.
The closures announced Friday are in addition to more than 180 that were previously announced by Sears. If he doesn't and Sears receives no other bids, the company could extend the deadline or liquidate its assets.
Lampert has to make his bid official by the end of the day.