When watching Batman v Superman: Dawn of Justice I first noticed that Bruce Wayne's house, to which he moved after Wayne Manor apparently burned down, was modelled closely after Farnsworth House. But then when seeing more interior shots, especially when he discussed with Alfred later, I realized that it actually is Farnsworth House in its entirety or at least accurately modelled after it.
So, did they really film those scenes at Farnsworth House or just design Bruce Wayne's home based on it? If they really used the actual house on-location, then how did they realize the huge body of water in front of the house? Bruce Wayne's house seems to be located directly at the water (where his secret entrance to the Batcave is), while Farnsworth House, yet lying on Fox River, is a little farther from the water. Did they actually flood the whole area for real or employ CGI to create it (or a mixture of both)? Or maybe they filmed the interior scenes at Farnsworth House and employed a model/CGI for the exterior shots?