diff --git a/src/features/retro-office/RetroOffice3D.tsx b/src/features/retro-office/RetroOffice3D.tsx
index 3376725..98f77b9 100644
--- a/src/features/retro-office/RetroOffice3D.tsx
+++ b/src/features/retro-office/RetroOffice3D.tsx
@@ -2704,12 +2704,13 @@ export function RetroOffice3D({
     target: [number, number, number];
     zoom?: number;
   } | null>(null);
+  const [sceneMode, setSceneMode] = useState<"city" | "office">("city");
+  const cityScapeMode = sceneMode === "city";
   const LOCAL_CAMERA_TARGET = useMemo(
     () =>
       toWorld(LOCAL_OFFICE_CANVAS_WIDTH / 2, LOCAL_OFFICE_CANVAS_HEIGHT / 2),
     [],
   );
-  const cityScapeMode = true;
   const cityCameraTarget = LOCAL_CAMERA_TARGET;
   const CAM_POS = useMemo<[number, number, number]>(() => {
     const activeTarget = cityScapeMode ? cityCameraTarget : LOCAL_CAMERA_TARGET;
@@ -2728,6 +2729,12 @@ export function RetroOffice3D({
     () => ({ pos: CAM_POS, target: cameraTarget, zoom: cameraZoom }),
     [CAM_POS, cameraTarget, cameraZoom]
   );
+  const handleEnterOfficeFromCity = useCallback(() => {
+    setSceneMode("office");
+  }, []);
+  const handleReturnToCity = useCallback(() => {
+    setSceneMode("city");
+  }, []);
   const canvasResetKey = useMemo(
     () =>
       [
@@ -5460,7 +5467,10 @@ export function RetroOffice3D({
             />
 
             {/* Floor + walls — always visible, no async loading. */}
-            <SceneFloorAndWalls showRemoteOffice={cityScapeMode} />
+            <SceneFloorAndWalls
+              showRemoteOffice={cityScapeMode}
+              onEnterHeadquarters={handleEnterOfficeFromCity}
+            />
 
             {/* Wall pictures — procedural, no async loading. */}
             <SceneWallPictures showRemoteOffice={cityScapeMode} />
@@ -7373,6 +7383,17 @@ export function RetroOffice3D({
           )}
         </div>
       ) : null}
+      {!immersiveOverlayActive && !cityScapeMode ? (
+        <div className="absolute top-3 left-3 z-20">
+          <button
+            type="button"
+            onClick={handleReturnToCity}
+            className="rounded-md border border-cyan-500/35 bg-[#071018]/92 px-3 py-1.5 text-[10px] font-semibold uppercase tracking-[0.14em] text-cyan-100 transition-colors backdrop-blur-sm hover:border-cyan-300/55 hover:text-white"
+          >
+            Back to City
+          </button>
+        </div>
+      ) : null}
       {!readOnly && settingsModalOpen ? (
         <div className="absolute inset-0 z-30 flex items-start justify-end overflow-y-auto bg-black/35 p-4 backdrop-blur-[1px]">
           <div className="flex max-h-[calc(100vh-2rem)] w-full max-w-sm flex-col overflow-hidden rounded-xl border border-cyan-500/20 bg-[#05090d]/95 shadow-2xl">
diff --git a/src/features/retro-office/scene/environment.tsx b/src/features/retro-office/scene/environment.tsx
index 92d6289..e27adfc 100644
--- a/src/features/retro-office/scene/environment.tsx
+++ b/src/features/retro-office/scene/environment.tsx
@@ -1,6 +1,6 @@
 "use client";
 
-import { memo, useMemo, useRef, type ReactNode } from "react";
+import { memo, useMemo, useRef, useState, type ReactNode } from "react";
 import { useFrame } from "@react-three/fiber";
 import type * as THREE from "three";
 import {
@@ -653,8 +653,17 @@ function RoadTile({
   );
 }
 
-function FullCityScene({ centerX, centerZ }: { centerX: number; centerZ: number }) {
+function FullCityScene({
+  centerX,
+  centerZ,
+  onEnterHeadquarters,
+}: {
+  centerX: number;
+  centerZ: number;
+  onEnterHeadquarters?: () => void;
+}) {
   const cityGrid = useMemo(() => buildCityGrid(), []);
+  const [hqHovered, setHqHovered] = useState(false);
   const baseOffsetX = centerX - ((CITY_GRID_COLUMNS - 1) * CITY_GRID_CELL_SIZE) / 2;
   const baseOffsetZ = centerZ - ((CITY_GRID_ROWS - 1) * CITY_GRID_CELL_SIZE) / 2;
   const cityWidth = CITY_GRID_COLUMNS * CITY_GRID_CELL_SIZE;
@@ -753,7 +762,29 @@ function FullCityScene({ centerX, centerZ }: { centerX: number; centerZ: number
           />
         );
       })}
-      <group position={hqPosition}>
+      <group
+        position={hqPosition}
+        onPointerOver={(event) => {
+          event.stopPropagation();
+          setHqHovered(true);
+        }}
+        onPointerOut={(event) => {
+          event.stopPropagation();
+          setHqHovered(false);
+        }}
+        onClick={(event) => {
+          event.stopPropagation();
+          onEnterHeadquarters?.();
+        }}
+      >
+        <mesh position={[0, 0.01, 0.18]} rotation={[-Math.PI / 2, 0, 0]}>
+          <planeGeometry args={[3.2, 2.8]} />
+          <meshBasicMaterial
+            color={hqHovered ? "#fde68a" : "#bbf7d0"}
+            transparent
+            opacity={hqHovered ? 0.24 : 0.14}
+          />
+        </mesh>
         <TowerBlock
           position={[-0.52, 0, -0.26]}
           width={0.9}
@@ -782,6 +813,22 @@ function FullCityScene({ centerX, centerZ }: { centerX: number; centerZ: number
           trimColor="#dcfce7"
           windowColor="#bfdbfe"
         />
+        <mesh position={[0, 0.02, -1.02]} rotation={[-Math.PI / 2, 0, 0]}>
+          <planeGeometry args={[1.85, 0.34]} />
+          <meshBasicMaterial
+            color={hqHovered ? "#fef08a" : "#e0f2fe"}
+            transparent
+            opacity={0.92}
+          />
+        </mesh>
+        <mesh position={[0, 0.03, -1.02]}>
+          <planeGeometry args={[1.7, 0.18]} />
+          <meshBasicMaterial color="#0f172a" transparent opacity={0.98} />
+        </mesh>
+        <mesh position={[0, 0.04, -1.02]}>
+          <planeGeometry args={[1.58, 0.12]} />
+          <meshBasicMaterial color={hqHovered ? "#fef08a" : "#f8fafc"} transparent opacity={1} />
+        </mesh>
       </group>
       <CityTrafficLayer
         cityRoadSpanX={CITY_GRID_CELL_SIZE * CITY_GRID_COLUMNS * 0.82}
@@ -861,8 +908,10 @@ const buildCityGrid = (): CityGridCell[] => {
 
 export const FloorAndWalls = memo(function FloorAndWalls({
   showRemoteOffice = true,
+  onEnterHeadquarters,
 }: {
   showRemoteOffice?: boolean;
+  onEnterHeadquarters?: () => void;
 }) {
   const districtWidth = CANVAS_W * SCALE;
   const districtHeight = CANVAS_H * SCALE;
@@ -919,7 +968,13 @@ export const FloorAndWalls = memo(function FloorAndWalls({
   const groundHeight = showRemoteOffice ? districtHeight : localOfficeHeight;
 
   if (showRemoteOffice) {
-    return <FullCityScene centerX={localOfficeCenterX} centerZ={localOfficeCenterZ} />;
+    return (
+      <FullCityScene
+        centerX={localOfficeCenterX}
+        centerZ={localOfficeCenterZ}
+        onEnterHeadquarters={onEnterHeadquarters}
+      />
+    );
   }
 
   return (