riversong-code-showcase/Source/Riversong/Game/World/Buildings/Visualizations/BuildingVisualization.cs

using System.Collections.Generic;
using UnityEngine;

namespace DanieleMarotta.RiversongCodeShowcase
{
    public class BuildingVisualization : MonoBehaviour
    {
        public List<GameObject> Tiers;

        public void SetTier(int tier)
        {
            for (var i = 0; i < Tiers.Count; i++) Tiers[i].SetActive(i == tier);
        }
    }
}