Conn. Gen. Stat. § 47-40: Giving of notice when party unknown.

When the owner of the estate to which such way or easement is claimed to be appurtenant is unknown, the notice under sections 47-38 and 47-39 may be given by conspicuously posting on the estate a copy of the notice and serving it on the person to whom the premises were last assessed for taxes in the place where they lie, and recording it as required in said sections.