Lincoln Terrace Neighborhood Association

i have lived in this neighborhood now for four years. recently signs were posted by the city to keep numerous cars from parking on the street during the daytime. one of my neighbors is a mechanic. this has forced him to start parking cars on the vacant lot next to my house. there has been a car jacked up on ramps for three days now. this has become a real eyesore and i dont like it. it lowers our property values and the esthetic quality of our historic neighborhood. do you have any suggestions?