I can tell you for sure that they don't. I know people in corporate real estate that won a bid to lease corporate real estate to Google recently. But that's true of almost all offices of major corporations. Very few of them own their own buildings, except maybe a headquarters here or there. They pretty much all lease.

> I meant google as a company.

I'm not sure what difference this makes.

As you can see here, Google has billions of assets, of which $19.7 billion are buildings.

Which is only a fraction of google and no one buys google for their real estate.

That's beside the point. The stock won't go to zero because it represents a share of ownership in a company that has billions of dollars more in assets than in liabilities. Real estate is just one of the many assets.

Edit: I thought I posted a link to Google's balance sheet in my parent comment, but apparently I left it out: https://www.marketwatch.com/investing/stock/goog/financials/...