Scale and Measurements in 2.5x

How does one set, know or work with units of measure in Blender. I am just making a rectangular building with specific dimensions and am having a bit of a challenge in this area. 3DSMax has the capability of entering dimensions to make the size you want. Does Blender have this yet? If it does, where is it hiding?
Thanks all…

Properties panel (N) and Scene settings

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