If you look at the building industry today in Thailand you note that many condo units are sold by what is called buying offplan. In other words the developer builds the property while taking in funds to complete the project. It can be risky as was shown in 1997!
If you are looking at buying real estate in Thailand then you need to speak to a Thai lawyer about the types of title deeds which are available in Thailand. Some are simply title deeds which only allows you to hold the property but not sell it. Be warned!