I’m no expert on this by any means but I’d imagine most people buy investment property through a corporation for the corporate shield (firewall).
Most of the same reasons that apply to incorporating as a small business owner apply with real estate investing.
I’d go so far as to say that it also makes sense to have each property that you have be owned by a separate LLC.
This way, any liabilities that you have for one of your properties (tenant lawsuit, etc) don’t bleed over and affect any of your other properties. For instance, you could declare bankruptcy on one property (corporation) and all your personal assets (as well as your other properties) are protected.