Ticker_MTCounter.cs

// This is just an excerpt, of course...
namespace CrashLanding {
    public class Ticker_MTcounter : Building {
        public void DoSpawn(int tickAmt) {
            Predicate<IntVec3> validator = (Predicate<IntVec3>) (x => {
                foreach (IntVec3 c in GenAdj.OccupiedRect(x, Rot4.North, new IntVec2(3, 3))) {
                    if (!c.InBounds(this.Map) || c.Fogged(this.Map) || !c.Standable(this.Map) || c.Roofed(this.Map) && c.GetRoof(this.Map).isThickRoof)
                        return false;
                    foreach (Thing thing in c.GetThingList(this.Map)) {
                        if (thing.def.preventSkyfallersLandingOn)
                            return false;
                    }
                }
                return true;
            });
            // rest of the method left as an exercise for the reader and their own decompiler
        }
    }
}