Add all files

app/Models/Property.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Models;
+
+use App\Observers\PropertyObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+#[ObservedBy([PropertyObserver::class])]
+class Property extends Model
+{
+    use HasFactory;
+
+    public $guarded = [];
+
+    public function parent_property()
+    {
+        return $this->belongsTo(CustomProperty::class, 'custom_property_id');
+    }
+
+    public function model()
+    {
+        return $this->morphTo();
+    }
+}