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From April 2004, foreigners may not buy a condo in Thailand from a Thai person in a condo apartment building in which the over-all ownership by foreigners is more than 49% of the total number of units.
You could let TILALEGAL check for 49% rule restricting ownership for you please go to http://www.tilalegal.com/title-search-thailand.php our services to check condominium in Thailand will takes approx. 3-4 days only.
"In April, 1999, the original Thai Condominium Act was amended so that foreigners could buy a condo from a Thai person regardless of the number of units already owned by other foreigners. The limit prior to the change had been 49%. That old rule has been reinstated - as of April 2004, foreigners may not buy a condo from a Thai person in a condo apartment building in which the over-all ownership by foreigners is more than 49% of the units.
An alien may now have ownership only of a condominium unit in a proportion not higher than 49% of the total space of all units in that condominium at the time the application for condominium registration is being lodged.