I started by editing the lines and pivot points on the subdivisions of the primitive cube object, before deleting the faces that I didn't require, I extruding some of the faces back to make them look like bricks. Next, mirrored the object on each axis, and deleted the lines & pivots points in the centre of the model; after using the bevel on the lines of model edges & added some subdivisions on the faces with the Add Divisions tool. Finally, created a UV map of the object for creating the albedo map.