Game concept · All Under Heaven
Japanese Manor Building
The game also links it as Japanese Manor Buildings, Manor Building, Manor Buildings.
From the game's encyclopedia
Japanese Manor Buildings are unique and persistent improvements to a Japanese Manor.
A large variety of structures are available for construction and may be built by the Manor's owner to generate private income, expand the family's Influence, and gain access to a number of Decisions, Interactions, and more.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Japanese Manor Building is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "Japanese Manor Buildings are unique and persistent improvements to a Japanese Manor." It is part of Domicile Building. The game also links it as Japanese Manor Buildings, Manor Building and Manor Buildings. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.