Is 「どこにいくのがよろしいですか」 a correct way to ask for directions? I visit an office and enquire where (floor, desk, etc) I should go - > Would this be an incorrect expression? If so, what is the mistake? What would be a better way to ask the same?

Even though I think your Japanese sentence has been rewritten by someone IIRC, it is actually much better and, more importantly, more natural than the other answerers have made it seem like.

We do actually say something close to that when we do not know where to go at all in a place like City Hall or any larger place with many sections, rooms, staff members, etc. In other words, when we do not know the exact name of the section or the name of the person in charge of the function for which you have visited.

We say:

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To make it even better, state what you need to do first as in:

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