I have written into my offer for a lease on a condo we are renting next year, (sic) the "Lessor" shall file (Online or otherwise) a TM30 Immigration Department registration for the "Alien" - "Lessee" and provide to said "Alien" - "Lessee" a receipt of such notification together with a copy of the condo Tabien Baan' showing the "lessee's" name therein. I also attached a downloaded Thai Script document detailing the TM30 requirement by Immigration for all "Aliens" to be registered within 24 hours of their arrival. It has occurred to me real estate people are as ill-informed this requirement as are the general public.
TLDR : Answer Summary
The discussion revolves around the responsibility for filing the TM30 registration with the Immigration Department in Thailand. While many believe it is the landlord's duty, several comments highlight that tenants (foreigners) may also share this responsibility. It is emphasized that regardless of who should file, tenants must ensure that the TM30 is filed timely to avoid potential fines or complications with immigration services.