Banging door by neighbor disturbing tenant

[Vikas Raoot]

My Tenant has been complaining now for more than a month about his neighbor banging doors which is disturbing him a lot. This is in a condo complex and I requested HOA to send a gentle reminder to that neighbor for being courteous to others- but unfortunately it hasn't helped. My tenant initially went and spoke to them but that didn't seem to help matters. I am planning to go and talk to this guy now but I don't have high hopes. Is there a city law (King county area here in seattle) which I could leverage to sort things out here . Any other options I could go for if I don't want to get into legal roads right away?