if over 50 you can put 800k in a thai bank or LTR which is very expensive. You will now have to pay income to subject to allowances and DTA. Many people plan to leave.
you could try going to immigration, show them your condo papers and say you are going to retire and live in your condo and ask for a letter of consent to open a bank account, i did it last year. do not forget the changed tax laws, if u are not careful you will pay tax on the 800k.