diff --git a/app/Models/Tenants/Tenant.php b/app/Models/Tenants/Tenant.php
index 282d41f..7f33967 100644
--- a/app/Models/Tenants/Tenant.php
+++ b/app/Models/Tenants/Tenant.php
@@ -18,6 +18,32 @@ class Tenant extends Model
 {
     use ModelTrait, SoftDeletes;
 
+    // 데모 테넌트 유형 상수
+    const TYPE_STD = 'STD';
+
+    const TYPE_TPL = 'TPL';
+
+    const TYPE_HQ = 'HQ';
+
+    const TYPE_DEMO_SHOWCASE = 'DEMO_SHOWCASE';
+
+    const TYPE_DEMO_PARTNER = 'DEMO_PARTNER';
+
+    const TYPE_DEMO_TRIAL = 'DEMO_TRIAL';
+
+    const DEMO_TYPES = [
+        self::TYPE_DEMO_SHOWCASE,
+        self::TYPE_DEMO_PARTNER,
+        self::TYPE_DEMO_TRIAL,
+    ];
+
+    // 데모 options 키 상수
+    const OPTION_DEMO_PRESET = 'demo_preset';
+
+    const OPTION_DEMO_LIMITS = 'demo_limits';
+
+    const OPTION_DEMO_READ_ONLY = 'demo_read_only';
+
     protected $fillable = [
         'company_name',
         'code',
@@ -34,6 +60,9 @@ class Tenant extends Model
         'options',
         'tenant_st_code',
         'billing_tp_code',
+        'tenant_type',
+        'demo_expires_at',
+        'demo_source_partner_id',
     ];
 
     protected $guarded = [
@@ -47,6 +76,7 @@ class Tenant extends Model
 
     protected $casts = [
         'trial_ends_at' => 'datetime',
+        'demo_expires_at' => 'datetime',
         'expires_at' => 'datetime',
         'last_paid_at' => 'datetime',
         'max_users' => 'integer',
@@ -244,4 +274,132 @@ private function formatBytes(int $bytes): string
 
         return round($bytes, 2).' '.$units[$pow];
     }
+
+    // ─── options 헬퍼 메서드 ───
+
+    public function getOption(string $key, mixed $default = null): mixed
+    {
+        return data_get($this->options, $key, $default);
+    }
+
+    public function setOption(string $key, mixed $value): self
+    {
+        $options = $this->options ?? [];
+        data_set($options, $key, $value);
+        $this->options = $options;
+
+        return $this;
+    }
+
+    // ─── 데모 테넌트 관련 메서드 ───
+
+    /**
+     * 데모 테넌트인지 확인 (모든 데모 유형)
+     */
+    public function isDemoTenant(): bool
+    {
+        return in_array($this->tenant_type, self::DEMO_TYPES);
+    }
+
+    /**
+     * 데모 쇼케이스(공용 읽기전용)인지 확인
+     */
+    public function isDemoShowcase(): bool
+    {
+        return $this->tenant_type === self::TYPE_DEMO_SHOWCASE;
+    }
+
+    /**
+     * 파트너 데모인지 확인
+     */
+    public function isDemoPartner(): bool
+    {
+        return $this->tenant_type === self::TYPE_DEMO_PARTNER;
+    }
+
+    /**
+     * 고객 체험 데모인지 확인
+     */
+    public function isDemoTrial(): bool
+    {
+        return $this->tenant_type === self::TYPE_DEMO_TRIAL;
+    }
+
+    /**
+     * 데모 만료 여부 확인
+     */
+    public function isDemoExpired(): bool
+    {
+        if (! $this->isDemoTenant()) {
+            return false;
+        }
+
+        // 쇼케이스는 만료 없음
+        if ($this->isDemoShowcase()) {
+            return false;
+        }
+
+        return $this->demo_expires_at && now()->gt($this->demo_expires_at);
+    }
+
+    /**
+     * 데모 읽기전용인지 확인
+     */
+    public function isDemoReadOnly(): bool
+    {
+        return $this->isDemoShowcase()
+            || $this->getOption(self::OPTION_DEMO_READ_ONLY, false);
+    }
+
+    /**
+     * 데모 테넌트만 조회하는 스코프
+     */
+    public function scopeDemo($query)
+    {
+        return $query->whereIn('tenant_type', self::DEMO_TYPES);
+    }
+
+    /**
+     * 데모 프리셋 조회
+     */
+    public function getDemoPreset(): ?string
+    {
+        return $this->getOption(self::OPTION_DEMO_PRESET);
+    }
+
+    /**
+     * 데모 수량 제한 조회
+     */
+    public function getDemoLimits(): array
+    {
+        return $this->getOption(self::OPTION_DEMO_LIMITS, [
+            'max_items' => 100,
+            'max_orders' => 50,
+            'max_productions' => 30,
+            'max_users' => 5,
+            'max_storage_gb' => 1,
+            'max_ai_tokens' => 100000,
+        ]);
+    }
+
+    /**
+     * 데모 → 정식 테넌트로 전환
+     */
+    public function convertToProduction(): void
+    {
+        $this->update([
+            'tenant_type' => self::TYPE_STD,
+            'demo_expires_at' => null,
+            'demo_source_partner_id' => null,
+        ]);
+
+        // options에서 데모 관련 키 제거
+        $options = $this->options ?? [];
+        unset(
+            $options[self::OPTION_DEMO_PRESET],
+            $options[self::OPTION_DEMO_LIMITS],
+            $options[self::OPTION_DEMO_READ_ONLY]
+        );
+        $this->update(['options' => $options ?: null]);
+    }
 }
diff --git a/database/migrations/2026_03_13_100000_add_demo_columns_to_tenants_table.php b/database/migrations/2026_03_13_100000_add_demo_columns_to_tenants_table.php
new file mode 100644
index 0000000..f0e74a6
--- /dev/null
+++ b/database/migrations/2026_03_13_100000_add_demo_columns_to_tenants_table.php
@@ -0,0 +1,46 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * 데모 테넌트 지원을 위한 tenants 테이블 확장
+     *
+     * - tenant_type ENUM에 데모 유형 추가 (DEMO_SHOWCASE, DEMO_PARTNER, DEMO_TRIAL)
+     * - demo_expires_at: 체험 만료일 (Tier 3 고객 체험 30일 제한)
+     * - demo_source_partner_id: 데모를 생성한 영업파트너 ID
+     *
+     * @see docs/features/sales/demo-tenant-policy.md
+     */
+    public function up(): void
+    {
+        // tenant_type ENUM 확장: 기존 STD/TPL/HQ + 데모 유형 3개
+        DB::statement("ALTER TABLE tenants MODIFY COLUMN tenant_type ENUM('STD', 'TPL', 'HQ', 'DEMO_SHOWCASE', 'DEMO_PARTNER', 'DEMO_TRIAL') NOT NULL DEFAULT 'STD' COMMENT '테넌트 유형: STD=일반, TPL=템플릿, HQ=본사, DEMO_SHOWCASE=공용데모, DEMO_PARTNER=파트너데모, DEMO_TRIAL=고객체험'");
+
+        Schema::table('tenants', function (Blueprint $table) {
+            $table->datetime('demo_expires_at')
+                ->nullable()
+                ->after('trial_ends_at')
+                ->comment('데모 만료일시 (Tier 3: 생성일+30일)');
+
+            $table->unsignedBigInteger('demo_source_partner_id')
+                ->nullable()
+                ->after('demo_expires_at')
+                ->comment('데모 생성 영업파트너 ID (sales_partners.id)');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('tenants', function (Blueprint $table) {
+            $table->dropColumn(['demo_expires_at', 'demo_source_partner_id']);
+        });
+
+        // tenant_type ENUM 원복
+        DB::statement("ALTER TABLE tenants MODIFY COLUMN tenant_type ENUM('STD', 'TPL', 'HQ') NOT NULL DEFAULT 'STD' COMMENT '테넌트 유형: STD=일반, TPL=템플릿, HQ=본사'");
+    }
+};