If you rename a neighborhood in the Network view of Workgroup Manager so that it starts with a space, the neighborhood will not be available. The "Layout" tab will list the neighborhood, but it will not exist within the LDAP domain.
The neighborhood will not appear in the Network view in the Finder of a bound client unless you rename it, delete it, and recreate it.
Rename the neighborhood so it has no leading space(s). Then, delete the neighborhood and recreate it before it becomes available again. Only removing the leading space from the existing record will not resolve the issue.