The City is not responsible for graffiti on private property. It would be the responsibility of the property owner to resolve the issue.
However if the graffiti contains profanity or is obscene, and is within public view, the city will review and take steps to have the graffiti removed.

My understanding is that the City is supposed to send a letter to the property owner to clean, so I am reopening this for that to happen please.

Sorry for the inconvenience, this case was not supposed to closed. You are correct on the process that needs to take place.

The original graffiti was painted over, but the next night there was new graffiti.