It would seem the publi beach access and up to the wet area of the beach is public property. Obviously I can't walk onto someone's property to access that beach, but I certainly can access the beach in front of their house via another means, setup a chair, and they can't do a darn thing about it.
Me and my friends use to go to Deal Beach and access from a public beach, and the Rich jerk who's house was there would always call the cops, cops would show up to tell the rich dude he was wrong. Good times.