In a residential context, the failure of the landlord tor return the security deposit or otherwise make a timely claim to the money renders any late claim invalid. The landlord is required to return the deposit. If you were to retain an attorney to seek the deposit in court, the landlord would e responsible for your attorneys' fees. If you decide to proceed on your own without an attorney, you can do so. If the amount if less than $5,000, you can file the claim in small claims court. The difficulty you mentioned in locating the landlord is something that requires a little investigation. You can search the property appraiser's office to identify the legal owner of the property. If the property is owned by a corporation, the officers and registered agent can be located at www.sunbiz.org. Once you identify the owner, you can fill out the small claims forms and identify the owner and address. The Sheriff will serve it.
small claims court--there are processes for suit against party who is dodging the plaintiff.
district court if you wnat an attorney to handle the details.
As a practical matter if you can't find the LL, your 'win' in court might be mitigated a bit, but if you stick to it, you can likely find the LL eventually and enforce your judgment.
Don't delay, then forget, and finally miss the closing of the statute of limitations that would prevent you from bringing suit ever.
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Start with a letter sent certified mail to the management office.
Say that you did not receive a letter or the check returning your Sec. Dep.
Demand that they send the check to your new address and include your new
address in the letter.
If you have to sue in small claims court, the process server or sheriff will
attempt to serve the defendant. They may have to make more than one
attempt, but if there is an office they should be able to eventually.