if ur lot is on a foundation then build your guide walls on a foundation too. Make the guide walls two storys high...same height at the lot before you lower the second story walls (so if you where doing a two story high house with a thrid story for skylights you'd have three story high guide walls - basically guide walls must be the same height as the skylight level before reducing them)
So turn the cheat on boolpropconstrainfloorelevation false and lower the corner of the guide walls by 12 clicks (if your lot foundation is raised, reduce the number of clicks you lower the guide walls)
Should see this once you've lowered the guide wall (notice the guide wall is now 4 clicks higher than the 1 story level lot)
Use the level terrain tool and drag from the lowered guide wall across over the lot
this will lower all the walls including the skylights and back guide wall to be 4 clicks high
Guide for foundation height V number of clicks lowered
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