Malls have been in decline for decades. Public pools barely exist anymore either. (https://www.poolmagazine.com/pool-news/america-is-losing-pub...). If you're in a wealthy city you probably still have a decent community center. Libraries are probably the most common space avilable, but they are also under constant attack by republicans. In wealthy cities you can find all kinds of services there. Smaller libraries will have some areas for reading and meeting.