I can see two lights in your setup, both in the right. Keep in mind that shadows will be always projected away from the light source. In your case that’s the left-facing faces of your objects as seen in the blue house, and the green one doesn’t get any light because it’s too far away from the point light, which isn’t nearly as bright as the sun.
You have some options to fix this: Use an HDRI as the source of an environment light to will fill in these shadows. You can also add objects / planes outside the screen and behind the camera to bounce off light back to the scene, with the added benefit of looking more realistic as IRL these buildings wouldn’t exist in a void.
Another option is to position the secondary light in the left/front, but I wouldn’t advise this. Unless that light represents an actual light source in the scene I’d scrap this one completely since it’ll cast shadows conflicting with the supposed lightning of the scene, a pretty noticeable mistake when it comes to archviz.