below; south of
Suffix used in Kyoto street addresses to indicate a location south of a named street or landmark. Part of the traditional Kyoto address system.
この店は四条通下ルにある。
This shop is located south of Shijo Street.
住所には「烏丸
The address says 'south of Karasuma Street'.
From the verb 下がる (さがる, 'to go down'), used as a suffix in Kyoto addresses to mean 'south of'.