Do I need to re-file the TM30 form for my condo upon re-entering Thailand?

The TM30 form, which is filed by the property owner when a foreigner takes residence, is typically valid unless there is a change in the foreigner's status or if they leave the country for an extended period. In your case, since you are re-entering Thailand after two months, the condo owner does not necessarily need to re-file the TM30 if you are returning to the same property. However, it's advisable to confirm with the landlord or local immigration office. If your landlord is unable to file it again, you may inquire if it's possible to submit it yourself using your rental contract.