diff --git a/src/app/api/public/berths/[mooringNumber]/route.ts b/src/app/api/public/berths/[mooringNumber]/route.ts
index 81a409b3..126d019e 100644
--- a/src/app/api/public/berths/[mooringNumber]/route.ts
+++ b/src/app/api/public/berths/[mooringNumber]/route.ts
@@ -5,9 +5,11 @@ import { db } from '@/lib/db';
 import { ports } from '@/lib/db/schema/ports';
 import { berths, berthMapData } from '@/lib/db/schema/berths';
 import { interestBerths, interests } from '@/lib/db/schema/interests';
+import { berthTenancies } from '@/lib/db/schema/tenancies';
 import { errorResponse } from '@/lib/errors';
 import { logger } from '@/lib/logger';
-import { toPublicBerth } from '@/lib/services/public-berths';
+import { isTenanciesModuleEnabled } from '@/lib/services/tenancies-module.service';
+import { isPermanentTenureType, toPublicBerth } from '@/lib/services/public-berths';
 
 /**
  * GET /api/public/berths/[mooringNumber]
@@ -105,7 +107,32 @@ export async function GET(
         .limit(1),
     ]);
 
-    const out = toPublicBerth(berth, mapData[0] ?? null, specificInterestRows.length > 0);
+    // Tenancies-module status flip: an active permanent-class tenancy
+    // pushes the berth to "Sold" when the module is enabled for this port.
+    let hasActivePermanentTenancy = false;
+    if (await isTenanciesModuleEnabled(port.id)) {
+      const activeTenancy = await db
+        .select({ tenureType: berthTenancies.tenureType })
+        .from(berthTenancies)
+        .where(
+          and(
+            eq(berthTenancies.portId, port.id),
+            eq(berthTenancies.berthId, berth.id),
+            eq(berthTenancies.status, 'active'),
+          ),
+        )
+        .limit(1);
+      hasActivePermanentTenancy = activeTenancy.some((row) =>
+        isPermanentTenureType(row.tenureType),
+      );
+    }
+
+    const out = toPublicBerth(
+      berth,
+      mapData[0] ?? null,
+      specificInterestRows.length > 0,
+      hasActivePermanentTenancy,
+    );
 
     if (out.Status !== 'Available' && out.Status !== 'Under Offer' && out.Status !== 'Sold') {
       logger.error({ berthId: berth.id, status: out.Status }, 'Public berth status out of range');
diff --git a/src/app/api/public/berths/route.ts b/src/app/api/public/berths/route.ts
index ef57a9ac..770d5719 100644
--- a/src/app/api/public/berths/route.ts
+++ b/src/app/api/public/berths/route.ts
@@ -5,9 +5,15 @@ import { db } from '@/lib/db';
 import { ports } from '@/lib/db/schema/ports';
 import { berths, berthMapData } from '@/lib/db/schema/berths';
 import { interestBerths, interests } from '@/lib/db/schema/interests';
+import { berthTenancies } from '@/lib/db/schema/tenancies';
 import { errorResponse } from '@/lib/errors';
 import { logger } from '@/lib/logger';
-import { toPublicBerth, type PublicBerth } from '@/lib/services/public-berths';
+import { isTenanciesModuleEnabled } from '@/lib/services/tenancies-module.service';
+import {
+  isPermanentTenureType,
+  toPublicBerth,
+  type PublicBerth,
+} from '@/lib/services/public-berths';
 
 /**
  * GET /api/public/berths
@@ -109,8 +115,35 @@ export async function GET(request: Request): Promise<Response> {
     const mapByBerth = new Map(mapRows.map((m) => [m.berthId, m]));
     const specificInterestSet = new Set(specificInterestRows.map((r) => r.berthId));
 
+    // Tenancies module: per-port flag. When enabled, an active tenancy
+    // with a permanent-class tenure type pushes a berth to "Sold" in the
+    // public feed (per docs/tenancies-design.md §"Public map status flip").
+    // When disabled, the lookup is skipped entirely — preserves the
+    // pre-module behaviour for ports that haven't opted in.
+    const permanentTenancyBerthIds = new Set<string>();
+    if (await isTenanciesModuleEnabled(port.id)) {
+      const activeTenancyRows = await db
+        .select({ berthId: berthTenancies.berthId, tenureType: berthTenancies.tenureType })
+        .from(berthTenancies)
+        .where(
+          and(
+            eq(berthTenancies.portId, port.id),
+            eq(berthTenancies.status, 'active'),
+            inArray(berthTenancies.berthId, berthIds),
+          ),
+        );
+      for (const row of activeTenancyRows) {
+        if (isPermanentTenureType(row.tenureType)) permanentTenancyBerthIds.add(row.berthId);
+      }
+    }
+
     const list = berthRows.map((b) =>
-      toPublicBerth(b, mapByBerth.get(b.id) ?? null, specificInterestSet.has(b.id)),
+      toPublicBerth(
+        b,
+        mapByBerth.get(b.id) ?? null,
+        specificInterestSet.has(b.id),
+        permanentTenancyBerthIds.has(b.id),
+      ),
     );
 
     // Validate the response enum before returning - any unknown status
diff --git a/src/lib/services/public-berths.ts b/src/lib/services/public-berths.ts
index 5ac18b2f..426664a9 100644
--- a/src/lib/services/public-berths.ts
+++ b/src/lib/services/public-berths.ts
@@ -78,20 +78,41 @@ function toString(value: unknown): string | null {
 }
 
 /**
- * Derive the public-facing status string from the CRM's internal status
- * + the per-berth `is_specific_interest` flag. Per plan §1:
+ * Tenure types that are treated as "permanent-class" by the public-map
+ * status resolver — an active tenancy with one of these tenure types
+ * pushes a berth into "Sold" even when `berths.status` is something
+ * weaker (`available`, `under_offer`). Per docs/tenancies-design.md §
+ * "Public map status flip". Seasonal / fixed-term tenancies do NOT flip
+ * the public status (they fall through to the existing precedence).
+ */
+const PERMANENT_TENURE_TYPES = new Set(['permanent', 'fee_simple', 'strata_lot']);
+
+export function isPermanentTenureType(tenureType: string | null | undefined): boolean {
+  return typeof tenureType === 'string' && PERMANENT_TENURE_TYPES.has(tenureType);
+}
+
+/**
+ * Derive the public-facing status string. Precedence:
  *
- *   Public "Under Offer" = berth.status = 'sold'? No - that's "Sold".
- *                         berth.status = 'under_offer' OR
- *                         at least one interest_berths row marked
- *                         is_specific_interest = true ON an active
- *                         (non-archived) interest.
+ *   Sold > Under Offer > Available
+ *
+ * Sold can come from:
+ *   1. berths.status = 'sold' (explicit admin set), OR
+ *   2. an active tenancy with tenure_type in PERMANENT_TENURE_TYPES
+ *      exists for this berth (only when the tenancies module is enabled).
+ *
+ * Under Offer fires when berth.status='under_offer' OR at least one
+ * interest_berths row marked is_specific_interest=true exists on an
+ * active (non-archived, non-closed) interest. Seasonal / fixed-term
+ * active tenancies do not flip the public status — they fall through
+ * to the existing under-offer / available precedence.
  */
 export function derivePublicStatus(
   internalStatus: string,
   hasSpecificInterest: boolean,
+  hasActivePermanentTenancy = false,
 ): PublicStatus {
-  if (internalStatus === 'sold') return 'Sold';
+  if (internalStatus === 'sold' || hasActivePermanentTenancy) return 'Sold';
   if (internalStatus === 'under_offer' || hasSpecificInterest) return 'Under Offer';
   return 'Available';
 }
@@ -117,6 +138,7 @@ export function toPublicBerth(
   berth: Berth,
   mapData: BerthMapData | null | undefined,
   hasSpecificInterest: boolean,
+  hasActivePermanentTenancy = false,
 ): PublicBerth {
   return {
     Id: berth.id,
@@ -127,7 +149,7 @@ export function toPublicBerth(
     'Side Pontoon': toString(berth.sidePontoon),
     'Power Capacity': toNumber(berth.powerCapacity),
     Voltage: toNumber(berth.voltage),
-    Status: derivePublicStatus(berth.status, hasSpecificInterest),
+    Status: derivePublicStatus(berth.status, hasSpecificInterest, hasActivePermanentTenancy),
     Area: toString(berth.area),
     'Mooring Type': toString(berth.mooringType),
     'Bow Facing': toString(berth.bowFacing),
diff --git a/tests/unit/services/public-berths.test.ts b/tests/unit/services/public-berths.test.ts
index b2dae69f..de5f6b23 100644
--- a/tests/unit/services/public-berths.test.ts
+++ b/tests/unit/services/public-berths.test.ts
@@ -1,6 +1,10 @@
 import { describe, it, expect } from 'vitest';
 
-import { derivePublicStatus, toPublicBerth } from '@/lib/services/public-berths';
+import {
+  derivePublicStatus,
+  isPermanentTenureType,
+  toPublicBerth,
+} from '@/lib/services/public-berths';
 import type { Berth, BerthMapData } from '@/lib/db/schema/berths';
 
 function makeBerth(overrides: Partial<Berth> = {}): Berth {
@@ -93,6 +97,43 @@ describe('derivePublicStatus', () => {
   it('plain available stays available', () => {
     expect(derivePublicStatus('available', false)).toBe('Available');
   });
+
+  // ─── Tenancies P4: permanent-tenancy flip ─────────────────────────────
+  describe('hasActivePermanentTenancy flag', () => {
+    it('flips an "available" berth to "Sold" when an active permanent tenancy exists', () => {
+      expect(derivePublicStatus('available', false, true)).toBe('Sold');
+    });
+    it('flips an "under_offer" berth to "Sold" (permanent tenancy is the strongest signal)', () => {
+      expect(derivePublicStatus('under_offer', true, true)).toBe('Sold');
+    });
+    it('explicit berths.status="sold" still resolves to "Sold" (idempotent)', () => {
+      expect(derivePublicStatus('sold', false, true)).toBe('Sold');
+    });
+    it('false flag falls through to existing precedence', () => {
+      expect(derivePublicStatus('available', true, false)).toBe('Under Offer');
+      expect(derivePublicStatus('available', false, false)).toBe('Available');
+    });
+    it('default-omitted flag preserves pre-module behaviour', () => {
+      expect(derivePublicStatus('available', true)).toBe('Under Offer');
+    });
+  });
+});
+
+describe('isPermanentTenureType', () => {
+  it('returns true for permanent-class tenure types', () => {
+    expect(isPermanentTenureType('permanent')).toBe(true);
+    expect(isPermanentTenureType('fee_simple')).toBe(true);
+    expect(isPermanentTenureType('strata_lot')).toBe(true);
+  });
+  it('returns false for seasonal / fixed-term', () => {
+    expect(isPermanentTenureType('seasonal')).toBe(false);
+    expect(isPermanentTenureType('fixed_term')).toBe(false);
+  });
+  it('returns false for null / undefined / unknown values', () => {
+    expect(isPermanentTenureType(null)).toBe(false);
+    expect(isPermanentTenureType(undefined)).toBe(false);
+    expect(isPermanentTenureType('garbage')).toBe(false);
+  });
 });
 
 describe('toPublicBerth', () => {