From the department of good ideas:

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A helpful commenter has a suggestion for BrickUnderground's perpetually locked out Rental Rookie: "I have a spare key hidden taped to the underside of a piece of decorative furniture in the hall on another floor in the building.  Periodically I go to check to make sure it's still there.  Nine years later it's still there and thankfully I only had to go for it once." Genius.