Simple stab at deferred decision making

DeferredDecider.cs

public class RenovationPolicy {
  public RenovationRequest FileRequestFor(Building building) {
    if(building.WasBetween(10.YearsAgo(), 25.YearsAgo()).WhenConstructed()) {
      //...
    }
  }
}

public class Building {
  internal BuildingAgeConstraint WasBetween(Date lower, Date upper) {
    //Forwarding of private state to be able to defer decision making
    return new BuildingAgeConstraint(_constructionDate, lower, upper);
  }
}

public class BuildingAgeConstraint {
  public BuildingAgeConstraint(Date constructionDate, Date lower, Date upper) {
    _constructionDate = constructionDate;
    _lower = lower;
    _upper = upper;
  }

  public bool WhenConstructed() {
    return _constructionDate >= lower && _constructionDate <= upper;
  }
}