Forever 21's operator, F21 OpCo, said it plans on vacating all of its approximately 354 leased stores after completing closing sales.

Restaurants, mall retailers, and small mom-and-pop brick-and-mortar stores have all faced significant struggles to survive. And many were gobbled up by larger corporate incumbents who had the money on hand to hunker down and weather the ongoing storm.

Forever 21 stores in the U.S. — including 17 in Pennsylvania — are poised to go out of business after the company's owners filed for Chapter 11 bankruptcy protection. Why it matters: The retailer was a pioneer in fast fashion,