This is the 8063rd most frequent Japanese word.
安宅
"安宅" (Ataka) typically refers to a place name in Japan or can mean a peaceful residence.
In this sentence, '安宅' refers to a proper noun as the name of a historic building or site. It is regarded for its historical significance.
安宅は歴史的な建物として有名です。
Ataku is famous as a historical building.
Here, '安宅' is again treated as a proper noun, but in this context, it could refer to a broader scenario or situation connected to the given name.
安宅の疑いが晴れて安心しました。
I was relieved when the suspicion over Ataku was cleared.
In this example, '安宅' is a noun used as the name of a house in a described area.