Commercial real-estate markets have been turned upside down. These are the new winners and losers — and the key deals to keep an eye on.

· Offices, hotels, and malls were emptied by the coronavirus. Even as they reopen, the disruption has many thinking we're looking at a new normal for how we occupy space. 
· Some big firms are rethinking office needs, while others charge ahead with expansion.
· Lenders are looking to unload debt tied to hotel properties as...