How can I apply for a Retirement Visa in Thailand as a property owner?

Why do people come to facebook for advice when what they find here is really irrelevant. If you are interested in a visa then go to the source.

Owning property is irrelevant. This all depends on where you are currently. If outside Thailand its fairly easy, just get a Non O and when you visit Thailand convert to a Retirement extension with 800k baht in your bank for the qualifying period. Alternatively visit an agent and get them to furnish your account with 800k baht for between 12,500 and 25,000 depending on location. If you are currently in Thailand you can convert your current entry to a Non O/Retirement extension, but nowadays its not straightforward.

Where are you currently?

If you are already in Thailand on a tourist entry then if you have 15-21 days left on your stamp (depending on location) you can visit your local immigration office and ask them what you need to convert to a Non-O visa based on age, you'll need 800k baht in a bank account (possiblybl transfered from overseas) but not every immigration office can do it.

If you are currently outside of Thailand apply for the 90 day Non-O visa based on being over 50 before you travel to Thailand, once you enter make sure you have 800k baht minimum in your thai bank account for 2 months and when down to the last 30 days of your stamp apply for a 12 months extension of stay based on retirement

Owning a apartment or condo doesn't help much .....since u already have a thai bank acct u can come to thailand on a tourist visa and convert that to a 90days nonO retirement by filling TM87 and showing 800k baht in your thai acct with more than 15days left on your tourist visa

Not another one.

Apply on line through embassy for the Non-O visa ( 90 day) before you arrive. Extend for 12 months based on retirement at immigration office.