Non-Warehouse Bldgs From Google Earth

I am using a combination of Google Earth & SketchUp to create a 3d Panorama of a portion of old London (circa 1880s) and have been able to download a number of buildings from 3d Warehouse. There are some buildings, however, which are not in 3d Warehouse but which obviously have 3d representations in Google Earth. Is there a way to download a model directly from Google Earth without it being in 3d Warehouse?

Thanks in advance for any help you can give me.