This apartment building was probably a larger single family home with servants. That's the plate for a "butler button", which are very common in dining rooms of wealthier family homes. Sometimes they're in the floor in the library or parlour too - so you don't have get up to push the button on the wall.
source https://www.inspectorsjournal.com/topic/19095-id-brass-thing-in-the-floor/?do=findComment&comment=175550
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