Section 302. Real property actions; venue

A  real property action, as
  defined in § 203 of this act, whether asserted by a plaintiff or by  any
  party by way of counterclaim, cross-claim or third-party claim, shall be
  brought  and  adjudicated only in the county in which such real property
  or a part thereof is situated. If by virtue of the venue  applicable  to
  the  cause of action asserted by plaintiff the main action is triable in
  a county other than that in which the real  property  is  situated,  the
  court must either:
    (a) transfer the entire action to the county wherein the real property
  is  situated,  if  the transfer may be effected without prejudice to the
  rights of any party; or
    (b) strike the real property  cause  of  action,  no  matter  by  whom
  asserted,  without prejudice to the party asserting it to commence it in
  the proper county.
    If more than one real property cause of action appear, the  court  may
  make  such  disposition  as  is just under the circumstances, and a real
  property action, no matter by whom asserted, may be tried  in  a  county
  other than that in which the real property or a part thereof is situated
  only if there is reason to believe that an impartial trial cannot be had
  in the latter county.