先 as a suffix

When used as a suffix, (さき) indicates the place where something is done.

Further Reading

Examples

Is the Order a Rabbit? » Volume 1 » Page 50 (Right) » Panel 1

(わたし)下宿(げしゅく)(さき)が千夜ちゃんの(いえ) だったらここでお手伝(てつだ) させてもらったんだろうなー」

Cocoa says if the place where she’s lodging were Chiya’s house, Cocoa would be help out here in Chiya’s family’s café.

Is the Order a Rabbit? » Volume 1 » Page 55 (Left) » Panel 2

「リゼ先輩(せんぱい)バイト(さき)()ってみたかったのに…」

Syaro thinks of how she wanted to visit Rize’s part-time workplace.

Flying Witch » Volume 3 » Page 34 » Panel 2

「こっちの二人(ふたり)居候(いそうろう)(さき)親戚(しんせき)千夏(ちなつ)ちゃんと圭くん(けい)くんです」

Makoto introduces Chinatsu and Kei as her two relatives she’s lodging with.