Wow, that's horrible. I remember years back when the Corporation we live in came in and tore down all our trails. There were acres in a forest, all well built, all sweet stuff... but no, some kid fell doing something stupid and the parents sued and it all went. In the end, we ended up getting hooked up by a guy who owned a section of forest a bit farther away. We were building there secretly for years, and he finally discovered us, yelled at us for 1/2 hour, then agreed that if we signed waivers and kept it quiet we could go. There's only a few of us that can ride there, but sometimes talking to people can be worth it. Regardless of it being on private property, we've still had random people tear them numerous times, but all that meant was that we had to build them bigger, stronger, harder to wreck and better. Sucks that it didn't work out for you, but hopefully you'll find somewhere better to build and progress your riding. :)