The structural engineers will have to get in and look at the details, but an older, lightly-constructed brick building can indeed have a catastrophic failure like this due to deterioration of the supporting structures. And once the framework starts down, the collapse accelerates.
Read this book for details, especially the chapter on the collapse of the Civic Tower in Pavia, Italy - death from old age.
That’s an excellent book.
It looks to me that a column or structural wall was altered in the center of the 4 story building. That movement of support on the left side of that building caused collapse toward the hapless thrift store.