in japanese english loanwords ("wasei-eigo"), the term "apartment" ("apaato") is used for lower-income housing and "mansion" ("manshon") is used for high-end apartments; but both terms refer to what english-speakers regard as an apartment (or condominium) and not the level of luxury of a mansion in english parlance. see housing in japan. "danchi" is the japanese word for a large cluster of apartment buildings of a particular style and design, typically built as public housing by government authorities.