Different case, same "facial vs as applied" problem
That twist is that the landowners didn't start the rights determination process till later, and got caught up further when the City incorporated and adopted and amended the County's land use regulations.
I think there may some different defenses and issues than were presented in the Monroe case ---- in particular, what happens if property is subjected to a limitation by one government agency or local government, then the same restriction is reapplied by another jurisdiction - does a new cause of action get created? But that question is totally buried in the larger mistake regarding facial vs as applied challenges.