adjusting wall height

[tinyhouseguy]

For the purpose of viewing a plan in doll house mode I like to lower all the walls to around 3 to 4 ft to provide a better view of the interior. I must lower each wall one at a time. Is there a simpler way to lower all the walls at one time? 

thanks 

[Chopsaw]

If you don't mind seeing hollow walls the Cross Section Slider is the tool to use.