creating a multi platform elevator

Here is a bit of start code. It assumes the elevator platform is a Rigidbody with'isKinematic' set to true. It defines the original position as floor 0. If you don't want eased movement, change from Lerp() to MoveTowards() and adjust the 'speed' parameter. Attach this script to your platform. You can hit the 0 - 9 keys to move up to specific floors. You can use GUI to construct buttons rather than my use of 'inputString'.

 #pragma strict
 
 public var deltaFloor = 1.25;
 public var newPos;
 public var speed = 1.5;
 
 private var startFloor : Vector3;
 
 function Start() {
     newPos = transform.position;
     startFloor = transform.position;
     transform.position = startFloor + startFloor * deltaFloor;
 } 
    
 function Update () {
     if (Input.inputString.Length > 0) {
         var val : int;
         if (int.TryParse(Input.inputString, val)) {
             SelectFloor(val);
         }
     }
 
      var pos = Vector3.Lerp(transform.position, newPos, Time.deltaTime * speed);
      rigidbody.MovePosition(pos);
 }
 
 function SelectFloor(floor : int) {
     newPos = startFloor + floor * deltaFloor * Vector3.up;
 }