No superstition here. We have many co-ops that have apartment numbers ending in 11 and 13. It may just be the way the hallways were laid out, but not really sure.
I because the corner at the end of the hallway have rooms that could have been apartments but they made them hair salon, lounges and laundry they don't need numbers. So that would throw the number system of count with these odd numbers.
Most hotels, apartments and offices don't have those numbers because a lot of people view them to be cursed/unlucky numbers. ie: superstitious reasons
Ask the management
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