本館 ほんかん
honkan

Noun

1. main building (as opposed to an annex, outbuilding, etc.)

別館 べっかん本館 ほんかん北側 きたがわにある。
bekkanwa honkanno kitagawani aru.
The annex is on the north of the original building.
Noun

2. this library; this museum; this theatre; this hall; this building