YOU SAID:

i went to the bathroom to the left of the hallway

INTO JAPANESE

私は廊下の左側のトイレに行きました

BACK INTO ENGLISH

I went to the toilet on the left side of the hallway

INTO JAPANESE

廊下の左側にあるトイレに行きました

BACK INTO ENGLISH

I went to the toilet on the left side of the hallway