The OP is not asking about an extension, he is asking about what he needs to retire in Thailand. You can see others have given him advice about how to get a retirement visa. The application for the retirement options is via the Thai embassy website. Making an extension in Thailand is totally different which is why i never mentioned it.
Houses are sold online nowadays, properties managed online too along with receipt of rents. Landlords, real estate investors have gained DTVS from the London Embassy. If they show how they work online, should not be a problem getting one in NY.
Anonymous participant 195 ok..it must be USA specific,, as other embassies make it clear they do not accept stocks. i had to divest, like many others to put the 500k in a bank account.