株式会社オープンハウス・アーキテクト

株式会社オープンハウス創業 : 代表取締役に荒井正昭が就任 : 本社を東京都渋谷区に開設

オープンハウス株式会社設立。新井正明が代表取締役社長に就任。東京渋谷区に本社（「渋谷営業所」）を開設。

「株式会社センチュリー21・ジャパン」とフランチャイズ契約を締結

Concluded a franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD."

子会社・株式会社オープンハウス・ディベロップメント（旧社名：創建ビルド）において、自社新築一戸建て住宅の販売を開始

Commenced the sale of newly built single-family homes built by the Company itself through the subsidiary Open House Development Co., Ltd. (former company name: Souken Build Ltd.).

Registered as a First-class Architect Office [No. 46671 registered by the Governor of Tokyo].

Obtained the Special Construction License [No. (Special - 14) 117385 issued by the Governor of Tokyo].

Opened "Setagaya Sales Center" in Setagaya-ku, Tokyo.

東京渋谷区内で本社（「渋谷営業所」）を移転。

本社（「渋谷営業所」）と「世田谷営業所」を合併し、総床面積300坪（10,675平方フィート）のロードサイド販売センターのグランドオープンを開催。

Opened "Kinshicho Sales Center" in Sumida-ku, Tokyo.

建築用地および建物取引業免許【国土交通大臣（1）7349号】を取得。

Opened "Sakura-Shinmachi Sales Center" in Setagaya-ku, Tokyo.

Opened "Mizonokuchi Sales Center" in Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture.

株式会社アイビーネット（旧社名：イトーピアビジネスネット株式会社）を伊藤忠商事株式会社より購入、不動産金融事業に進出

Purchased IB Net Co., Ltd. (former company name: Ito-pia Business Net Co., Ltd.) from Itochu Corporation, and entered the real estate financing business.

Opened "Akabane Sales Center" in Kita-ku, Tokyo.

株式会社オープンハウス・ディベロップメントがマンションの販売を開始

Commenced the sale of condominiums through Open House Development Co., Ltd.

Opened "Nakano Sales Center" in Nakano-ku, Tokyo.

東京都千代田区丸の内に「丸の内事務所」を開設（本社機能を一部移転）

東京都千代田区丸の内に「丸の内オフィス」を開設（本社機能の一部移転）。

Opened "Ikebukuro Sales Center" in Toshima-ku, Tokyo.

米国カリフォルニア州に株式会社オープンハウス・ディベロップメントの100％子会社として、Open House Realty & Investments, Inc.を設立 : 中国上海市に株式会社オープンハウス・ディベロップメントの100％子会社として、旺佳建築設計諮詢（上海）有限公司を設立

Established Open House Realty & Investments, Inc. in California, U.S.A. as a wholly owned subsidiary of Open House Development Co., Ltd. and Wangjia Architectural Design Consulting (Shanghai) Co., Ltd. in Shanghai, China as a wholly owned subsidiary of Open House Development Co., Ltd.

Relocated "Mizonokuchi Sales Center" within Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture. Opened "Yokohama Sales Center" (Yokohama Station east exit) in Nishi-ku, Yokohama-shi, Kanagawa Prefecture.

東京都千代田区丸の内に株式会社オープンハウス・ディベロップメントの100％子会社として、株式会社ＯＨリアルエステート・マネジメントを設立

Established OH Real Estate Management Co., Ltd. in Marunouchi, Chiyoda-ku, Tokyo as a wholly owned subsidiary of Open House Development Co., Ltd.

「株式会社センチュリー21・ジャパン」との間のフランチャイズ契約を解約 : 自社ブランドによる営業を開始

Terminated the franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD." and commenced sales under the Company's own brand.

Relocated "Yokohama Sales Center" (Yokohama Station east exit) within Nishi-ku, Yokohama-shi, Kanagawa Prefecture.

東京都千代田区丸の内に本社を移転

本社を東京都千代田区丸の内に移転。

Opened "Kamata Sales Center" in Ota-ku, Tokyo.

東京証券取引所 市場第一部に上場（証券コード3288）

Listed on the First Section of the Tokyo Stock Exchange (Securities Code: 3288).

Opened "Nishi-Kasai Sales Center" in Nishi-Kasai, Edogawa-ku, Tokyo.

Opened "Kita-Senju Sales Center" in Kita-Senju, Adachi-ku, Tokyo.

Opened "Tsunashima Sales Center" in Kohoku-ku, Yokohama-shi, Kanagawa Prefecture.

Opened "Sasazuka Sales Center" in Sasazuka, Shibuya-ku, Tokyo.

Opened "Kawasaki Sales Center" in Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture.

株式会社アサカワホームを連結子会社化

Opened "OPEN HOUSE Group Osaka Office" in Kita-ku, Osaka-shi, Osaka. Converted Asakawa Home Co., Ltd. to a consolidated subsidiary.

Opened "Jiyugaoka Sales Center" in Jiyugaoka, Meguro-ku, Tokyo. Opened "Kichijoji Sales Center" in Kichijoji-honcho, Musashino-shi, Tokyo.

Opened "OPEN HOUSE Group Nagoya Office" in Nakamura-ku, Nagoya-shi, Aichi Prefecture. Opened "Shin-Yokohama Sales Center" in Kohoku-ku, Yokohama-shi, Kanagawa Prefecture.

Opened "Nerima Sales Center" in Toyotamakita, Nerima-ku, Tokyo.

米国テキサス州にOpen House Texas Realty & Investments LLCを設立

Established Open House Texas Realty & Investments LLC in Texas, U.S.A.

株式会社アサカワホームが株式会社オープンハウス・アーキテクトに商号変更

Launched the brokerage, single-family home and condominium business in the Nagoya metropolitan area. Opened "Sakae Sales Center" in Naka-ku, Nagoya-shi, Aichi Prefecture. Changed the trading name of Asakawa Home Co., Ltd. to Open House Architect Co., Ltd.

Opened "Nippori Sales Center" in Arakawa-ku, Tokyo. Opened "Kinshicho Kita Sales Center" in Kinshi, Sumida-ku, Tokyo. Changed the name of "Kinshicho Sales Center" (Kotobashi, Sumida-ku) to "Kinshicho Minami Sales Center." Opened "Oimachi Sales Center" in Shinagawa-ku, Tokyo. Opened "Musashi-Kosugi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture.

Opened "Kamiooka Sales Center" in Konan-ku, Yokohama-shi, Kanagawa Prefecture. Opened "Motoyama Sales Center" in Chikusa-ku, Nagoya-shi, Aichi Prefecture.

東京都中央区銀座に富裕層向けサービスの拠点として「GINZA SALON」を開設

Opened "GINZA SALON" as a center providing services to affluent customers in Ginza, Chuo-ku, Tokyo.

Opened "Urawa Sales Center" in Nakacho, Urawa-ku, Saitama-shi, Saitama Prefecture. Opened "Tsurumi Sales Center" in Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture.

Opened "Urawa Chuo Sales Center" in Takasago, Urawa-ku, Saitama-shi, Saitama Prefecture. Opened "Motosumiyoshi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture.

Opened "Gokiso Sales Center" in Showa-ku, Nagoya-shi, Aichi Prefecture. Opened "Shin-Koiwa Sales Center" in Katsushika-ku, Tokyo.

米国ハワイ州にOpen House Hawaii Realty & Investments LLCを設立

Established Open House Hawaii Realty & Investments LLC in Hawaii, U.S.A.

不動産特定共同事業許可取得 : 米国ハワイ州のSachi Hawaii-Pacific Century Properties LLC（不動産仲介業）、Sachi Hawaii-Pacific Century Property Management LLC（不動産管理業）を子会社化

Registered as a Real Estate Specified Joint Enterprise. Converted Sachi Hawaii-Pacific Century Properties LLC (real estate brokerage business) and Sachi Hawaii-Pacific Century Property Management LLC (property management business) in Hawaii, U.S.A. to subsidiaries.

Opened "Shin-Kawasaki Sales Center" in Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture.

株式会社ホーク・ワンを完全子会社化

Converted HAWK ONE CORPORATION to a wholly owned subsidiary. Opened "Musashi-Urawa Sales Center" in Numakage, Minami-ku, Saitama-shi, Saitama Prefecture. Opened "Kawaguchi Sales Center" in Kawaguchi-shi, Saitama Prefecture. Opened "Kanayama Sales Center" in Naka-ku, Nagoya-shi, Aichi Prefecture. Opened "OPEN HOUSE Group Fukuoka Office" in Fukuoka-shi, Fukuoka Prefecture.

Opened "Tenjin Sales Center" in Chuo-ku, Fukuoka-shi, Fukuoka Prefecture.

Opened "NAGOYA SALON" in Nakamura-ku, Nagoya-shi, Aichi Prefecture. Opened "Iidabashi Mansion (Condominium) Gallery" in Shinjuku-ku, Tokyo.

Opened "Sengawa Sales Center" in Chofu-shi, Tokyo. Opened "Aratamabashi Sales Center" in Mizuho-ku, Nagoya-shi, Aichi Prefecture.

株式会社群馬プロバスケットボールコミッション（群馬クレインサンダーズの運営会社）に資本参加

Invested in Gunma Pro Basketball Commission Co., Ltd. (operating company of the Gunma Crane Thunders).

Opened "Oji Sales Center" in Kita-ku, Tokyo. Opened "Hodogaya Sales Center" in Hodogaya-ku, Yokohama-shi, Kanagawa Prefecture. Commenced development of sales centers in the Chiba area, and opened "Motoyawata Sales Center" in Ichikawa-shi, Chiba Prefecture.

Opened "Honjin Sales Center" in Nakamura-ku, Nagoya-shi, Aichi Prefecture.

Opened "Ohashi Sales Center" in Minami-ku, Fukuoka-shi, Fukuoka Prefecture.

Opened "Ozone Sales Center" in Kita-ku, Nagoya-shi, Aichi Prefecture. Opened "Ogikubo Sales Center" in Suginami-ku, Tokyo. Opened "Kameari Sales Center" in Katsushika-ku, Tokyo.

株式会社プレサンスコーポレーションの株式を取得し、持分法適用関連会社化

Opened "Urayasu Sales Center" in Urayasu-shi, Chiba Prefecture. Acquired shares of PRESSANCE CORPORATION Co., Ltd., and converted it to an equity-method affiliate.

株式会社オープンハウス・プロパティマネジメントが不動産管理業務を開始

Opened "Narimasu Sales Center" in Itabashi-ku, Tokyo. Opened "Funabashi Sales Center" in Funabashi-shi, Chiba Prefecture. Open House Property Management Co., Ltd. launched the property management business.

株式会社プレサンスコーポレーションの株式を追加取得し、連結子会社化

Acquired additional shares of PRESSANCE CORPORATION Co., Ltd., and converted it to a consolidated subsidiary.

Opened "Omiya Sales Center" in Omiya-ku, Saitama-shi, Saitama Prefecture.

株式会社OHリアルエステート・マネジメントが株式会社オープンハウス・リアルエステートに商号変更

Changed the trading name of OH Real Estate Management Co., Ltd. to Open House Real Estate Co., Ltd. Relocated "Shin-Yokohama Sales Center" to Midori-ku, Yokohama-shi, Kanagawa Prefecture, and changed the name of the sales center to "Nakayama Sales Center."

Opened "Ofuna Sales Center" in Kamakura-shi, Kanagawa Prefecture. Opened "Takabata Sales Center" in Nakagawa-ku, Nagoya-shi, Aichi Prefecture. Opened "Kasugabaru Sales Center" in Kasuga-shi, Fukuoka Prefecture.

Opened "Shimokitazawa Sales Center" in Setagaya-ku, Tokyo. Opened "Kashiwa Sales Center" in Kashiwa-shi, Chiba Prefecture.

（株）おうちリンクが銀行代理業を開始

Opened "Nishiarai Sales Center" in Adachi-ku, Tokyo. Opened "Fujisawa Sales Center" in Fujisawa-shi, Kanagawa Prefecture. Launched the brokerage business in the Kansai area, opened "Umeda Sales Center" in Kita-ku, and "Tennouji Sales Center" in Abeno-ku, Osaka-shi, Osaka.

純粋持株会社へ移行し、「株式会社オープンハウス」より「株式会社オープンハウスグループ」に商号変更 : *事業部門は 100%子会社となる「株式会社オープンハウス(旧:株式会社オープンハウス準備会社)」に承継

東京証券取引所 プライム市場へ移行

本社を千代田区丸の内・JPタワーへ移転

株式会社三栄建築設計の株式を取得し、連結子会社化

株式会社三栄建築設計の株式を追加取得し、完全子会社化

株式会社三栄建築設計が株式会社メルディアに商号変更

2025年 : 株式会社プレサンスコーポレーションの株式を追加取得し、完全子会社化

4月 : 株式会社プレサンスコーポレーションの株式を追加取得し、完全子会社化