Array empties values on RunTime?

I am trying to create an array from my building objects I have created. My script BuildingManager holds an array of my building objects. The array is public and I have dragged the three cubes shown in the picture into my array(Should they be prefabs not in the instance of the game?)

Problem: When I run the game the array gets cleared to be the values I have specified under my BuildManager script. In the start function of my BuildManager it declares the size as five. I want the values to be the one the developer sets in the Unity Inspector!

Note: I realize some of my functions in BuildMenu do nothing currently. I am trying to just figure out why the array is cleared to empty objects before I implement them! Thanks.

Before running the game

After running the game

My scripts are as follows:

Building

 using UnityEngine;
 using System.Collections;
 
 public class Building : MonoBehaviour {
 
     public int curHealth=100;
     public int maxHealth=100;
     public int regenRate=2;
     public bool isAlive=true;
     
     public void destroy()
     {
         isAlive=false;
         this.destroy();
     }
 
     public void create()
     {
         isAlive=true;
     }
 
     public bool getAlive()
     {
         return isAlive;
     }
 
     public void hpUpdate()
     {
         if (curHealth<=0)
         {
             isAlive=false;
             destroy ();
         }
         else{
 
             if(curHealth<(maxHealth-regenRate))
             {
             curHealth+=2;
             }
 
         }
     }
 
 
     void FixedUpdate()
     {
         hpUpdate();
     }
 }
 

BuildingManager

 using UnityEngine;
 using System.Collections;
 
 public class BuildingManager : MonoBehaviour {
 
     public GameObject[] buildings;
 
     void Start(){
 
         buildings=new GameObject[5];
 
     }
 }
 

BuildMenu

 using UnityEngine;
 using System.Collections;
 
 public class BuildMenu : MonoBehaviour {
 
     public GameObject manager;
 
     BuildingManager buildingmanager; 
     GameObject[] buildingsArray;
 
     // Use this for initialization
     void Start () 
     {
         //gets the component of the build manager and assigns it to the type BuildManager var
         buildingmanager=manager.GetComponent<BuildingManager>();
 
         //set the array of gameobjects to the BuildingManager instance?????
         buildingsArray=buildingmanager.buildings;
     }
 
     void OnGUI () 
     {
         //if we get the input draw the window
         if(Input.GetButtonDown("Build"))
         {
             //draw the window
             drawMenu();
         }
         //then de render if f is hit again
     }
 
     void drawMenu()
     {
         GUI.Box(new Rect(30,30,Screen.width/2,Screen.height/2), "Header box");
 
         for (int i=0;i<buildingsArray.Length;i++)
         {
         
             Debug.Log(buildingsArray[i]);
         }
 
         //if a button is selected we want to start calling the raycast 
         //and destroy the window
         //position from the mouse and rendering 
         //something to show the position on the users screen
 
 
     }
 }