Can a letter of guarantee from my condominium owner help me obtain a longer visa or open a bank account in Thailand?

U stay in Thailand 3 months every year and you're unaware of the visa rules.... You're a strange man.... Get yourself informed from your Thai embassy for correct information....

Btw, I wouldn't bother going now or in the next months until they got rid off all the covid paperwork menace...

There is actually nothing a letter of guarantee from your landlord will do for you. Immigration could care less about it, as any visa/extension that requires proof of living arrangements require a whole different set of documents from your landlord. A letter of guarantee means nothing. Banks don't care about it. Immigration doesn't care about it. It can't be used to get a driver's license. It is basically a waste of paper. Any visa/extension requiring proof of rental require a lease, a copy the owner of the property's Thai ID card, and a copy of the house book he is listed in, not a letter of guarantee, and he must file a TM-30 the day you move in, that shows you live there.

There's no 'letter of guarantee' that gives you a longer visa.

If you have 800,000 Thai baht you can apply for a retirement visa, in your country or in Thailand good for a year.

There are ways to stay longer but you need to meet the visa requirements. Just what is it you are really wanting to do?

In June you were asking about staying two months

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Having a lease agreement in a condo does not have any help with getting you a longer visa.

Which country are you flying from to Thailand?

Are you fully vaccinated?

Are you age 50+ ?

Open up an account at a Thai bank but open it in YOUR name alone--if the bank will allow for this; sometimes you can have a Thai bank account as a farang, sometimes you cannot. Good luck with this!