別館|べっかんbekkan[0]heiban (flat)

1. nounannex (to a building); annexe; extension; supplementary building
   別館べっかんは本館ほんかんの北側きたがわにある。↗

   The annex is on the north of the original building.

• SynonymアネックスNeutralA loanword for an annex, used mostly in hotel and shopping-mall names; 「別館」 is the ordinary, everyday term.
• Related拡張部分かくちょうぶぶんNeutralAn explanatory term for the part added to enlarge or extend something; unlike 「別館」 it does not specifically mean a separate building.
• Antonym本館ほんかんNeutralThe main building of a facility, standing in contrast to the annex 「別館」.

Use 「別館」 for an annex of a hotel or museum, as in 「別館の客室」; 「アネックス」 often appears in hotel and mall names, 「拡張部分」 describes an added part, and 「本館」 is the opposite, the main building.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 本館ほんかんとは別べつに建たてられた建物たてもの。