There are many ways to obtain a long term visa in Thailand : marriage, retirement, employment, business, student visa, visa elite card, etc.
Internet is full of documents explaining how to get long term visas in Thailand but keep in mind that laws are often changing in Thailand, so don’t read old content. You can contact us if you have any question about visas.
Unfortunately a property Freehold does not entitle a foreigner to any special long term visa.
Have a look at Thai Embassy page for more information
