This is what you said:
"I would check to see if foreign quota is available as that is a big plus if it is. If it isn't, you have to set up a company to buy in company name and there is paperwork, with expenses, that needs to be filed every year. People go through the hassle of company ownership so they can buy houses and nice condos in desirable projects, such as Northshore, where foreign quota is full."
Sounds to me you are "advising" on how to buy a condo when the foreign percentage of ownership is already taken, particularly where you say, "you have to set up a company." .
Once again, is setting up a Thai company, solely for the purpose of owning a property here, legal, or illegal? It's a yes or no answer?