Abstract: A simulated log cabin structure, corner assembly and method are provided having advantages over conventional simulated log cabin structures. The structure has (i) a substrate wall layer, preferably an insulative board layer, (ii) spaced apart horizontal outer board layers, (iii) a mortar layer adhered to the substrate wall between the board layers, and (iv) a corner assembly having interconnecting alternating blocks. The structure may be quickly constructed by a method comprising (a) attaching insulative board to the exterior of a building frame, (b) applying mortar to the insulative board, (c) attaching horizontal boards to the frame in a spaced apart fashion to permit the mortar to be visible between the boards. The structure also has a corner assembly having interconnecting notched blocks having interior curved abutment faces for restricting horizontal movement of the blocks.