How does money laundering work in a real estate investment firm?

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I AM NOT ASKING FOR ADVICE ON HOW TO DO ANYTHING ILLEGAL! Lol.

I used to know someone whose dad owned a real estate investment firm that had 5.5 billion of assets.

They told me that there is a lot of money laundering that goes on.

How exactly does this work? Who launders it and how? If I had a business like that, I would think I would keep track of everything so that nothing is stolen.

I hope this isn't against the forum rules. I'm not asking for advice on how to do this, I'm just wondering how it works and how it happens.