Do resale properties need LFOs?
No, LFOs only apply to newly-built properties as the LFO is the originally authorisation for use as a dwelling. Once issued, the LFO thereafter becomes known as the Habitation Licence (Cédula de Habitabilidad or Cédula de Ocupación). If you are buying a resale property you will want to see an Habitation Licence from the town hall, rather than an LFO (though it is basically the same thing).