You could always appeal the condition to An Bord Pleanala. You have four weeks in which to do this starting from the date the decision was made. However, you do risk An Bord Pleanala reviewing the entire application again, as if it had seen it in the first instance and not just the attached condition.
Other than An Bord Pleanala removing or changing the condition, I don't see any alternative. It looks like the planning authority are trying to restrict any further residential development from occuring on your lands in the near future and to curtail the level of one-off rural housing in your area.