One thing to keep in mind is that a real estate photo is not entirely meant to be 100% authentic. Much like a fashion photo. You are trying to sell your house. What you really are looking for is an image that will stand out from the rest as potential buyers search through hundred's if not thousands of listing images. These images will definitely stand out.
That being said that is a pretty heavy handed and unnecessary use of HDR.
I don't think it's the HDR that's the problem... looks more like he didn't know how to do proper tone mapping in photomatix and he ended up with a surreal effect. yuck.
I wouldn't use these to sell a house, but I'm a big fan of the surreal look that HDR's can achieve. Maybe if you have the three or so photos that he used, you can try an exposure blend instead to get a more realistic look.
