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Open the file ACA3-02.dwg. What is the distance between the 2 desks on the left?
At first sight it appears that there appears to be only one column of desks on the left hand side. The reason for this is that there is additional data on a layer which has been frozen. Go to the layer control button and unfreeze any frozen layers, to see 2 desks on the left hand side. Then use the distance command to measure the space between them.
When you freeze a layer in Autocad it will be totally ignored the data on that layer. So the working size of the drawing data will be smaller. This is often used to speed up drawing on large files, though not so much of an issue these days as we have more powerful computers.