https://wiki.openstreetmap.org/wiki/Tag:telecom=data%20center

https://wiki.openstreetmap.org/wiki/Key:clli

CLLI is a telecom industry location code; it refers to the entire building, not an individual datacenter space within it.  This building is a "carrier hotel", with telecom/datacenter space being its primary purpose, and contains many data centers.  The wiki page for telecom=data_center suggests that the entire building should be tagged in most cases where a building contains a data center.