You can try searching for ‘Nearby models’ in your components window. This searches 3D Warehouse for other models that have been geolocated and are close to your coordinates. This doesn’t work well for rural areas but see here in Los Angeles there are many models to ‘grab’ and drop in place.
Second way is to do what @Julian_Smith said and import some open source buildings. they are typically just square boxes but that may be better than nothing. See earlier post for more details:Importing Buildings FROM Google Earth, into SketchUp - #11 by eric-s