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> 屋敷を一回りしただけで設計図を思い描き、 **本来なければおかしい部屋がない事を指摘する。**

What does the last sentence mean?

> Just by going around the mansion once he was able to drew a blueprint, **If
> it were not normal it points out the fact that there are no strange rooms?**

本来ならば=Normally  
本来なければ=Not normally ?

I am really not understanding that.  
Thank you
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2016-03-22T09:40:32.603
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2016-03-24T08:03:47.593
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grammar
本来なければ usage and meaning
You would parse it as:

> [(本来、なければおかしい)部屋がない]事を指摘する。

本来なければおかしい is a relative clause modifying the 部屋.

なければおかしい部屋 means なければならない部屋 / あるはずの部屋 / あるべき部屋, "a room which should exist,"
"a room which should be there."

So your sentence would be like:

> (lit.) He points out that [a room (which naturally should exist) doesn't
> exist].  
>  He points out that [a room (which naturally there should be) isn't there].  
>  He points out that [a room (which originally should be there) is missing].
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2016-03-22T11:11:49.207
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It seems you got a few things mixed up. Allow me to show you how I parse it.

**・なければおかしい is a clause modifying 部屋**

> [なければおかしい]部屋 ⇒ a room [that it would be strange if it didn't exist]

**・本来なければ is not the negative version of 本来ならば (It never is!)**

本来 here is an adverb that modifies (or is part of?) the relative clause.

> [ **本来** なければおかしい]部屋 ⇒ a room [that, **normally** , it would be strange if
> it didn't exist]

So, 本来なければおかしい部屋 is a noun phrase, acting as the subject of the clause
本来なければおかしい部屋 + が + ない (a room doesn't exist that, normally, it would be
strange if it didn't exist).

Lastly, 本来なければおかしい部屋がない事を指摘する I'd translate as:

> (...) points out the fact that a room is missing that naturally has to be
> there.

or something along those lines.
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2016-03-22T11:34:54.133
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2016-03-22T13:34:34.840
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I agree with the O.P.'s take of the first half of the Japanese text - Just by
going around the mansion once he was able to draw a blueprint, but I take the
latter part of it as;

“and pointed out that there is not the room that (originally) should be there
(as he envisaged in his blue print).”

本来なければおかしい means "Originally, it should be there / It’s unnatural to be
lacking in it.
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2016-03-22T11:34:58.437
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2016-03-22T11:48:31.137
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