If the property will appreciate in value and they uniquely know about that then: rent out the property to someone else and make even more to spend on malaria be

If the property will appreciate in value and they uniquely know about that then: rent out the property to someone else and make even more to spend on malaria bed nets, and have the conference in the cinderblock building or Nissen huts elsewhere. This is the center for effective altruism not center for building nerd Versailles.