How to see the buildings "backer" strong

Surface water for residential to back mountain, the rear of the building also should have to rely on, should be filled in.That building is behind the mountain, or have other tall and wide buildings, this is tantamount to sit.

If the rear how tower form similar buildings, because of its numerous, also belong to the backer.If there is a low mountain hills behind, because its are natural mountain, is strong, also for.But, if short, sparsely populated buildings behind than itself, and is on the mountain.