Checking if GameObject is withing an other GameObject?

I am working on a tower defence game, ive got the pathing working. but what im having issue with is:
I am creating the nodes for the path finding script dynamical and what i am trying to do is to delete the nodes that appear inside a wall. i cant use trigger colliders since it kills the pathing thinking the nodes are blocking everthing.

Here is the code creating the nodes and then checking if its inside a wall:

    private void CreateNodes(){
     for(int z = 0 - (int)numNodesHorizontal / 2; z < numNodesHorizontal - (int)numNodesHorizontal / 2; z++)
     {
         for(int x = 0 - (int)numNodesLength/ 2; x < numNodesLength - (int)numNodesLength / 2; x++)
         {
             GameObject node = Instantiate(nodePrefab) as GameObject;
             node.transform.parent = transform;
             node.transform.localScale  = new Vector3(1,1,1);
             node.name = "Node: x: " + x + ", z: " + z + ".";
             node.transform.localPosition = new Vector3(x, 5, z);
             nodes.Add(node);
         }
     }
 }
 
 void DestroyNodes(){
     for(int i = 0; i < nodes.Count; i++){
         for(int w = 0; w < walls.Length; w++){  
             if(nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).x - nodes[i].GetComponent<Collider>().bounds.size.x >= walls[w].transform.localPosition.x - (walls[w].GetComponent<Renderer>().bounds.size.x / 2) && 
             nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).x + nodes[i].GetComponent<Collider>().bounds.size.x <= walls[w].transform.localPosition.x + (walls[w].GetComponent<Renderer>().bounds.size.x / 2) &&
             nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).y - nodes[i].GetComponent<Collider>().bounds.size.y >= walls[w].transform.localPosition.y - (walls[w].GetComponent<Renderer>().bounds.size.y / 2) &&
             nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).y + nodes[i].GetComponent<Collider>().bounds.size.y <= walls[w].transform.localPosition.y + (walls[w].GetComponent<Renderer>().bounds.size.y / 2) &&
             nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).z - nodes[i].GetComponent<Collider>().bounds.size.z >= walls[w].transform.localPosition.z - (walls[w].GetComponent<Renderer>().bounds.size.z / 2) &&
             nodes[i].transform.TransformPoint(nodes[i].transform.localPosition).z + nodes[i].GetComponent<Collider>().bounds.size.z <= walls[w].transform.localPosition.z + (walls[w].GetComponent<Renderer>().bounds.size.z / 2) ){
               Destroy(nodes[i]);                   
             }
         }            
     }
 }