Myself and foreign acquaintances buying houses in different districts. Some have no problem doing it, most do, wanting Thai land to be in the name of fully Thai people, and have no problem in saying why: 'It looks like the foreigner is trying to buy land using their half foreign child. It will need to be in the name of their Thai wife/husband not the half foreign child'. Some offices have no problem, many or most do. YMMV.