I do not think there are any foreign banks here doing retail banking. You have to put the money in a thai bank, keep it there for at least 3 months and the balance can never go below 400k and must be back at 800k 3 months before renewal.
its a very quick process, you agree a price, pay a deposit, arrange a closing date, get a bankers draft for the closing amount, take the cash and the bankers draft to lands dep, meet the seller and do the exchange in front of the registrar. Only delay is the seller needs to get clearance from the condo admin that all monies are up to date, this can take a few weeks. I am assuming u are not buying a company own property. You get your name on the title there and then but takes a few days to get the blue book, If u buy thr realtor they will tell u exactly, if not get a lawyer. You will find a lot of info here: