Section 305. Assignees; corporations and associations

(a)  If  the  plaintiff  is  an  assignee  of the cause of action, the
  original owner of the cause of action shall be deemed the plaintiff  for
  the purpose of determining proper venue.
    (b)  A  corporation  or  unincorporated  association shall be deemed a
  resident of any district wherein it transacts business, keeps an office,
  has an agency or is established by law.