Oldie but a Goodie

A mystery grid

Took a walk to the bay and back and passed this old friend, one of more mysterious doorbells in the neighborhood. Twelve buttons sit in a blank grid at the front of a multiple-unit dwelling. Absent of labels, the mechanism begs the question as to how these buttons are employed. Are there a dozen units? Is it a very large numeric keypad with a single entry code? Is this a palatial single residence disguised as an apartment building?

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