A spendid estate with 屋敷

Kanji Explanation: Shelter and shops with 屋

Heiji shows up at Detective Mouri’s office looking for the missing Shin’ichi. While there, a case presents itself. Heijii tags along with Mouri to investigate.

毛利(もうり):: 「ほーーーーー　立派(りっぱ)なお屋敷(やしき)ですなーーー…」; “Oh, what a splendid estate.”; Literal: “Oh, it is a splendid estate, isn't it...”

Key Points

1屋敷(やしき) = a grand residence or estate

Here 屋敷(やしき) refers to a large, impressive private home.
It suggests a mansion-like property, not just an ordinary house.

2The お is honorific

The line says お屋敷(やしき), adding politeness and admiration.