If you are renting the condo, then yes, typically the landlord is the party responsible for fixing security devices. Send a letter requesting repair by certified mail, return receipt requested, to your landlord. If you are not renting and you own the condo, and by "landlord" you mean property manager, then the door is likely your responsibility.
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I agree with Mr. Koel. A certified letter is sufficient, but I also send one by regular mail as well in case the landlord does not pick up the certified letter at the post office. It just moves things along. Best of luck.
Actively practicing law in Texas. Inactive licenses in Arizona and Georgia. All answers are general in nature and no attorney/client relationship exists in this forum.