Posted by rfvv on Sunday, November 11, 2012 at 9:28pm.
1 and 2 are grammatical. There's a big difference, though, between the meanings of these sentences.
3. Is also grammatical. The second floor is usually the second floor above ground. However, I enter my apartment from the ground level, but because the ground slopes, the back of my apartment is actually one floor above ground level. Some buildings may have a ground floor, making the second floor two floors above ground level.
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