Thailand has restrictions on foreigners when it comes to owning land. However, a foreigner is entitled to acquire the freehold title of a condominium unit upon some conditions. Foreigners may own up 49% of the total units of building at any time. If the foreign freehold ownership has reached this limit, the remaining units may only be leased to foreigners under a lease agreement.
There is a misunderstanding on how to inherit the unit title to the heir. Although your heir has acquired the unit title by way of success, they are required to transfer the non-Thai currency from overseas in order to support the registration of the unit ownership transfer.
Investing in property may also allow you to get the proper visa to stay in Thailand if you have continued ownership of the unit for more than three consecutive years. More details are always available upon request.