Check out this 30x45x14 garage with lean too. building includes the following: 

30×45 garage with vertical Roof 
14′ wall height 
2) 12×14 chain hoist roll up doors 
1) 36×80 walk in door
2″ fiberglass insulation on roof 
1) 10x45x10 lean to 
certified 140mph/30psf