A large number of foreigners lease land over the long term since they cannot own land in their name as a freehold. The foreign tenant does not own any interest in the land. This is generally completely acceptable with the Thai government and the foreigner can have a wide spectrum of rights to the land during the term of the lease. The Foreigner may, if the lease stipulates it, even be able to own any building structure on the land in his name.
A foreign national may be entitled to own a land in Thailand in the name of a Thai company. And this can be done by registering a Limited Company or a registered Partnership in Thailand. Similarly, a foreigner who registers his company under Board of Investment may be entitled to buy 20 Rai of land for residential purpose.
A foreign national who is married to a Thai is entitled to legally own land in Thailand. However, the land must be registered in the Thai national’s name at the land office.
Leasing is yet another alternative for a foreign national to acquire land in Thailand. The maximum duration of a lease is 30 years with the chances of renew.
A company or Thai spouse may grant a right of superficies to the foreign national, giving him the right to own all constructions on the land.
Apartments or condominiums can be purchased by foreigners as long as at least 51% of the building is owned by Thais.
The best way to get guidance on your specific legal issue is to contact a lawyer.