This is the 3108th most frequent Japanese word.
併設
"併設" means "joint establishment" or "setting up together."
Here, "併設" refers to the library being established alongside the school.
この学校は図書館を併設しています。
This school has a library attached to it.
In this context, "併設" implies the two facilities — the restaurant and café — are set up together.
新しいレストランにはカフェが併設されています。
The new restaurant has a café established adjunctly.
The word "併設" denotes that the sports center is located and operated additionally alongside the park.