Videotape them, even if you're just using your celphone for a 15 second clip. Then call the cops and send a copy to a local TV investigative reporter. Those reporters love confronting people in these types of "lifestyle" issues, both the police for not acting, and the construction company for letting it happen. Makes for great word of mouth publicity for their future clientelle.
This happened recently at a golf course where the upper scale clientelle were constantly pissing on this guy's lawn and shrubs. He set up a video camera and posted all of the videos on line. He then called the local reporters who did a story on it.
https://www.youtube.com/watch?v=JJjjh_EB0nU