| 1997年09月 |
Open House Co., Ltd. founded. : Masaaki Arai assumed office as President & CEO. : Opened the Head Office ("Shibuya Sales Center") in Shibuya-ku, Tokyo. |
| 1997年10月 |
Concluded a franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD." |
| 2001年02月 |
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.). |
| 2001年08月 |
Registered as a First-class Architect Office [No. 46671 registered by the Governor of Tokyo]. |
| 2002年04月 |
Obtained the Special Construction License [No. (Special - 14) 117385 issued by the Governor of Tokyo]. |
| 2002年06月 |
Opened "Setagaya Sales Center" in Setagaya-ku, Tokyo. |
| 2003年11月 |
Relocated the Head Office ("Shibuya Sales Center") within Shibuya-ku, Tokyo. |
| 2004年01月 |
Merged the Head Office ("Shibuya Sales Center") and "Setagaya Sales Center," and held a grand opening of a roadside sales center with a total floor area of 300 tsubo (10,675 sq.ft) |
| 2005年09月 |
Opened "Kinshicho Sales Center" in Sumida-ku, Tokyo. |
| 2006年10月 |
Obtained the Building Lots and Buildings Transaction Business License [No. (1) 7349 issued by the Minister of Land, Infrastructure, Transport and Tourism]. |
| 2007年01月 |
Opened "Sakura-Shinmachi Sales Center" in Setagaya-ku, Tokyo. |
| 2008年04月 |
Opened "Akabane Sales Center" in Kita-ku, Tokyo. |
| 2008年10月 |
Commenced the sale of condominiums through Open House Development Co., Ltd. |
| 2009年04月 |
Opened "Nakano Sales Center" in Nakano-ku, Tokyo. |
| 2010年01月 |
Opened "Marunouchi Office" in Marunouchi, Chiyoda-ku, Tokyo (relocated a part of the Head Office functions). |
| 2010年03月 |
Opened "Ikebukuro Sales Center" in Toshima-ku, Tokyo. |
| 2010年09月 |
Established Open House Realty & Investments, Inc. in California, U.S.A. as a wholly owned subsidiary of Open House Development Co., Ltd. : Established Wangjia Architectural Design Consulting (Shanghai) Co., Ltd. in Shanghai, China as a wholly owned subsidiary of Open House Development Co., Ltd. |
| 2011年04月 |
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. |
| 2011年10月 |
Established OH Real Estate Management Co., Ltd. in Marunouchi, Chiyoda-ku, Tokyo as a wholly owned subsidiary of Open House Development Co., Ltd. |
| 2012年09月 |
Terminated the franchise agreement with "CENTURY 21 REAL ESTATE OF JAPAN LTD." : Commenced sales under the Company's own brand. |
| 2012年10月 |
Relocated "Yokohama Sales Center" (Yokohama Station east exit) within Nishi-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2013年01月 |
Relocated the Head Office to Marunouchi, Chiyoda-ku, Tokyo. |
| 2013年04月 |
Opened "Kamata Sales Center" in Ota-ku, Tokyo. |
| 2013年09月 |
Listed on the First Section of the Tokyo Stock Exchange (Securities Code: 3288). |
| 2013年10月 |
Opened "Nishi-Kasai Sales Center" in Nishi-Kasai, Edogawa-ku, Tokyo. |
| 2014年03月 |
Opened "Kita-Senju Sales Center" in Kita-Senju, Adachi-ku, Tokyo. |
| 2014年04月 |
Opened "Tsunashima Sales Center" in Kohoku-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2014年09月 |
Opened "Sasazuka Sales Center" in Sasazuka, Shibuya-ku, Tokyo. |
| 2014年10月 |
Opened "Kawasaki Sales Center" in Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2015年01月 |
Opened "OPEN HOUSE Group Osaka Office" in Kita-ku, Osaka-shi, Osaka. : Converted Asakawa Home Co., Ltd. to a consolidated subsidiary. |
| 2015年07月 |
Opened "Jiyugaoka Sales Center" in Jiyugaoka, Meguro-ku, Tokyo. : Opened "Kichijoji Sales Center" in Kichijoji-honcho, Musashino-shi, Tokyo. |
| 2016年04月 |
Opened "Nerima Sales Center" in Toyotamakita, Nerima-ku, Tokyo. |
| 2016年09月 |
Established Open House Texas Realty & Investments LLC in Texas, U.S.A. |
| 2016年10月 |
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. |
| 2017年01月 |
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." |
| 2017年04月 |
Opened "Oimachi Sales Center" in Shinagawa-ku, Tokyo. Opened "Musashi-Kosugi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2017年07月 |
Opened "Kamiooka Sales Center" in Konan-ku, Yokohama-shi, Kanagawa Prefecture. Opened "Motoyama Sales Center" in Chikusa-ku, Nagoya-shi, Aichi Prefecture. |
| 2017年09月 |
Opened "GINZA SALON" as a center providing services to affluent customers in Ginza, Chuo-ku, Tokyo. |
| 2017年10月 |
Opened "Urawa Sales Center" in Nakacho, Urawa-ku, Saitama-shi, Saitama Prefecture. Opened "Tsurumi Sales Center" in Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture. |
| 2018年01月 |
Opened "Urawa Chuo Sales Center" in Takasago, Urawa-ku, Saitama-shi, Saitama Prefecture. Opened "Motosumiyoshi Sales Center" in Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2018年04月 |
Opened "Gokiso Sales Center" in Showa-ku, Nagoya-shi, Aichi Prefecture. Opened "Shin-Koiwa Sales Center" in Katsushika-ku, Tokyo. |
| 2018年05月 |
Established Open House Hawaii Realty & Investments LLC in Hawaii, U.S.A. |
| 2018年06月 |
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. |
| 2018年07月 |
Opened "Shin-Kawasaki Sales Center" in Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2018年10月 |
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. |
| 2018年11月 |
Opened "Noborito Sales Center" in Tama-ku, Kawasaki-shi, Kanagawa Prefecture. |
| 2020年01月 |
Opened "Ohashi Sales Center" in Minami-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2020年04月 |
Opened "Ozone Sales Center" in Kita-ku, Nagoya-shi, Aichi Prefecture. |
| 2020年04月 |
Opened "Ogikubo Sales Center" in Suginami-ku, Tokyo. |
| 2020年04月 |
Opened "Kameari Sales Center" in Katsushika-ku, Tokyo. |
| 2020年05月 |
Opened "Urayasu Sales Center" in Urayasu-shi, Chiba Prefecture. |
| 2020年05月 |
Acquired shares of PRESSANCE CORPORATION Co., Ltd., and converted it to an equity-method affiliate. |
| 2020年07月 |
Opened "Ropponmatsu Sales Center" in Chuo-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2020年10月 |
Opened "Narimasu Sales Center" in Itabashi-ku, Tokyo. |
| 2020年10月 |
Opened "Funabashi Sales Center" in Funabashi-shi, Chiba Prefecture. |
| 2020年10月 |
Open House Property Management Co., Ltd. launched the property management business. |
| 2020年11月 |
Opened "Tenjin Mansion (Condominium) Gallery" in Chuo-ku, Fukuoka-shi, Fukuoka Prefecture. |
| 2021年01月 |
Acquired additional shares of PRESSANCE CORPORATION Co., Ltd., and converted it to a consolidated subsidiary. |
| 2021年02月 |
Opened "Omiya Sales Center" in Omiya-ku, Saitama-shi, Saitama Prefecture. |
| 2021年03月 |
Changed the trading name of OH Real Estate Management Co., Ltd. to Open House Real Estate Co., Ltd. |
| 2021年03月 |
Relocated "Shin-Yokohama Sales Center" to Midori-ku, Yokohama-shi, Kanagawa Prefecture, and changed the name of the sales center to "Nakayama Sales Center." |
| 2021年04月 |
Opened "Ofuna Sales Center" in Kamakura-shi, Kanagawa Prefecture. |
| 2021年04月 |
Opened "Takabata Sales Center" in Nakagawa-ku, Nagoya-shi, Aichi Prefecture. |
| 2021年04月 |
Opened "Kasugabaru Sales Center" in Kasuga-shi, Fukuoka Prefecture. |
| 2021年07月 |
Opened "Shimokitazawa Sales Center" in Setagaya-ku, Tokyo. |
| 2021年07月 |
Opened "Kashiwa Sales Center" in Kashiwa-shi, Chiba Prefecture. |
| 2022年01月 |
Shifted to a pure holding company structure, and changed the company name to Open House Group Co., Ltd. : * Succeeded its business divisions to the Company's wholly-owned subsidiary, Open House Co., Ltd. (former Open House Preparatory Company Co., Ltd.) |
| 2023年01月 |
The head office relocated to JP Tower in Marunouchi, Chiyoda-ku, Tokyo. |
| 2023年10月 |
Acquired shares of Sanei Architecture Planning Co., Ltd. and made it a consolidated subsidiary |
| 2023年11月 |
Additionally acquired shares of Sanei Architecture Planning Co., Ltd. and made it a wholly-owned subsidiary |
| 2024年03月 |
Sanei Architecture Planning Co., Ltd. changes its company name to Meldia Co., Ltd. |
| 2025年04月 |
Additional acquisition of shares of PRESSANCE CORPORATION Co.,Ltd., making it a wholly-owned subsidiary |
