youth center; young men's training and accommodation facility
A public or community institution providing training, lodging, and activities for young men; similar to a youth hostel or community center with a focus on personal development.
During summer vacation, I participated in volunteer activities at the youth center.
Compound of 青年 (young man) + の (possessive particle) + 家 (house/home), literally 'house of young men'. The term was commonly used for government or community-run facilities in post-war Japan.