There is a FREE service provided by Santa Clara County Goverment which can help neighbors work out problems. They are a volunteer group of people trained in mediation called Dispute Resolution Program Services. These people will attempt to set up meetings and assist you in mediating the dispute with your neighbor to come to an amicable resolution of your problem.
Dispute Resolution Program Services
Office of Human Relations
County Government Center
70 West Hedding Street
Lower Level West Wing
San Jose, CA 95110
408-299-2206 phone
408-297-2463 fax