It looks like this graffiti is on property privately owned, no? Don't think these buildings are owned by the town.

sometimes the town helps coordinate the cleanup http://www.masslive.com/news/worcester/index.ssf/2017/03/worcester_city_manager_edward_5.html

Ok, I'll send it over to the appropriate people with the hopes of them reaching out to the residents that own this (these) buildings. Thank you for posting this issue.