Sec. 6. (a) This section applies to the alienation, inheritance, or assignment of:
(1) an easement in gross of a commercial character that was created before January 1, 1990; and
(2) an interest in an easement in gross of a commercial character described in subdivision (1).
(b) This section applies to an easement in gross of a commercial character that was acquired by eminent domain.
(c) Unless the instrument that created the easement states that the easement may not be alienated, inherited, or assigned, the alienation, inheritance, or assignment of an easement in gross of a commercial character that occurred before April 1, 1990, is legalized and declared valid.