Money laundering means that you start with dirty money, take through a process and end up with clean money.
The input is cash [dirty] and the out put is also cash [clean]
So you buy something with the dirty cash...something that you know people will not ask many questions about the source of your cash...eg casino chips
Then you sell it soon afterward [probably at a loss - payment for the "cleaner"] and get clean money out.
Now, regarding the real estate balloon:
Are the suspected money launders buying is cash or through bank transactions [eg cheques, EFTs RTGSs]?
Are the suspected money launders selling the properties or keeping them for development...and later selling at a profit?
In 2002, I bought a plot of land in Thika for 53k. Last year, I decided to add a second one to make two...the going price in the area was 150k [that sounded like a fair appreciation]
Then the Chinese company put up their base camp in readiness for the building of the "superhighway".... long story short..... the prices doubled overnight! I have finally found some one to sell me the second plot. The price is 360k!!! He was asking for 400k but I managed to plead for a reduction.
Nothing is real unless it can be named; nothing has value unless it can be sold; money is worthless unless you spend it.