{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "8802",
  "company_name": "三菱地所",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/8802/",
  "api_url": "/api/8802/decisions.json",
  "updated": "2026-08-05",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/8802/",
  "count": 5,
  "description": "Index of this company's management decisions. One decision = one endpoint: follow api_url for the full dossier (background, the decision itself, outcome, quoted primary sources and references).",
  "decisions": [
    {
      "slug": "founding-1890",
      "url": "/tse/8802/decisions/founding-1890/",
      "api_url": "/api/8802/decisions/founding-1890.json",
      "year": 1890,
      "month": 3,
      "type": "founding",
      "title": "三菱地所創業——入札ゼロの丸ノ内買収から日本最大の不動産会社へ",
      "subtitle": "入札ゼロに終わった陸軍練兵場跡地・丸ノ内約35万坪を、松方正義 蔵相の打診で128万円で買い取った岩崎弥之助氏は、値の付かない原野をどう日本最大の不動産会社へ育てたか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "dissolution-remerger-1953",
      "url": "/tse/8802/decisions/dissolution-remerger-1953/",
      "api_url": "/api/8802/decisions/dissolution-remerger-1953.json",
      "year": 1953,
      "month": 4,
      "type": "reorganization",
      "tags": [
        "ma-merger"
      ],
      "title": "財閥解体による丸ノ内3分割と、3年後の陽和不動産・開東不動産の吸収合併",
      "subtitle": "分けられた丸ノ内をなぜ1社に戻したか——GHQに退けられた一元開発と、株の買い占め",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "marunouchi-redevelopment-1959",
      "url": "/tse/8802/decisions/marunouchi-redevelopment-1959/",
      "api_url": "/api/8802/decisions/marunouchi-redevelopment-1959.json",
      "year": 1959,
      "month": 7,
      "type": "strategy",
      "tags": [
        "st-capex",
        "st-premium"
      ],
      "title": "丸ノ内総合改造計画の策定と、赤煉瓦街から9階建てビル街への建て替え",
      "subtitle": "高さをどこまで求めるか——皇居前の美観と、借り手を失えない貸ビル業のあいだで",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "marunouchi-manhattan-plan-1988",
      "url": "/tse/8802/decisions/marunouchi-manhattan-plan-1988/",
      "api_url": "/api/8802/decisions/marunouchi-manhattan-plan-1988.json",
      "year": 1988,
      "month": 1,
      "type": "transformation",
      "tags": [
        "bm-model-shift",
        "st-capex"
      ],
      "title": "「丸の内マンハッタン化計画」の構想発表と、初代丸ビルの建て替えによる複合都市への転換",
      "subtitle": "オフィス専用の街をどう作り替えるか——猛反発で挫けた30年構想から、2代目丸ビルまでの14年",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "rockefeller-group-investment-1990",
      "url": "/tse/8802/decisions/rockefeller-group-investment-1990/",
      "api_url": "/api/8802/decisions/rockefeller-group-investment-1990.json",
      "year": 1990,
      "month": 4,
      "type": "acquisition",
      "tags": [
        "ma-crossborder-out",
        "gl-retreat"
      ],
      "title": "米ロックフェラーグループへの資本参加と、5年後のロックフェラーセンター投資事業からの撤退",
      "subtitle": "「向こうのノウハウを勉強する」という買収理由は、その後の5年にどこまで耐えたか",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 1,
      "url": "/api/8802/decisions/by-type/acquisition.json"
    },
    {
      "key": "founding",
      "count": 1,
      "url": "/api/8802/decisions/by-type/founding.json"
    },
    {
      "key": "reorganization",
      "count": 1,
      "url": "/api/8802/decisions/by-type/reorganization.json"
    },
    {
      "key": "strategy",
      "count": 1,
      "url": "/api/8802/decisions/by-type/strategy.json"
    },
    {
      "key": "transformation",
      "count": 1,
      "url": "/api/8802/decisions/by-type/transformation.json"
    }
  ],
  "by_decade": [
    {
      "key": "1890s",
      "count": 1,
      "url": "/api/8802/decisions/by-decade/1890s.json"
    },
    {
      "key": "1950s",
      "count": 2,
      "url": "/api/8802/decisions/by-decade/1950s.json"
    },
    {
      "key": "1980s",
      "count": 1,
      "url": "/api/8802/decisions/by-decade/1980s.json"
    },
    {
      "key": "1990s",
      "count": 1,
      "url": "/api/8802/decisions/by-decade/1990s.json"
    }
  ]
}