Abstract: A modular structure has a frame including header beams defining an outer perimeter of the structure at a top of the frame, header corner brackets connecting consecutively arranged header beams, footer beams defining an outer perimeter of the structure at a bottom of the structure, footer corner brackets connecting consecutively arranged footer beams, and intermediate beams extended between the top of the frame and the bottom of the structure, each intermediate beam being fixed with one of the header corner brackets, and fixed with one of the footer corners brackets. A roof supported on the frame includes an arm positioned on one of the header corner brackets. A turnbuckle fixed at a position closer to the top of the frame as compared to the bottom of the structure, and fixed at a position closer to the bottom of the structure as compared to the top of the frame.