I was wondering when someone would make this argument. It's not correct.
First of all, no one I've seen in this thread is necessarily advocating buying REITs or anything else. You could buy REITs, and therefore it's a choice to evaluate, but whether you should is a separate question.
Second, REITs employ leverage, quite a lot actually. REITs borrow. Whatever the benefits of leverage, they accrue to the REIT's shareholders. You personally are not assuming debt when you buy REIT shares with cash, but that's a good thing. It means you're not held personally liable for those debts, unlike a mortgage. And being personally responsible for less debt reduces your risks. A REIT's debt might be called "backside debt."
Third, you could buy REITs with "frontside" leverage. That's called margin, and brokers routinely extend margin to their clients. So you could "double up" on leverage, frontside and backside. Whether you should is a separate question.
It's never good enough to claim that you can (or probably will) make some dollars with a particular investment. That's not exciting. Buying a Singapore Government Security will do that. You should always compare a potential investment to next best alternatives. If there are better alternatives, then those should win.
By the way, in Singapore residential real estate fell in nominal value by an average of about 45% peak to trough during the late 1990s and rather rapidly, within just a couple years. Capital losses, even big ones, are VERY possible in real estate. Especially over short to medium time horizons. Of course there are also lease decay effects, but even with freeholds there's some depreciation.