This is a low poly apartment building I created using Blender 2.8b and it's new render engine eevee. The model is fully triangulated and works for any game engine (Unity3D, Unreal 4 etc.).
If you want to check out how this model was created, check out the embedded YouTube video I posted on my channel (https://www.youtube.com/channel/UCzJStEvk1lCnhgAIaW6qhPw). It is not very difficult to create these kind of objects, but you have to know how, so I explained it step by step in the video.