| Apr 1984 |
Established in Musashino City, Tokyo (capital 90 million yen) |
| Oct 1985 |
Formed a capital tie-up with Iida Home Max Co., Ltd. (Iida Home Max's fully-owned subsidiary) |
| May 1986 |
Formed a capital tie-up with Iida Construction Co., Ltd. (Iida Construction's subsidiary) |
| Aug 1988 |
Established the Housing Start-up Enterprise Cooperative as an associated company |
| Jan 1994 |
Dissolved a capital tie-up with Iida Home Max Co., Ltd. and Iida Construction Co., Ltd. |
| Dec 1997 |
Relocated the headquarters to Hoya City (current Nishitokyo City) (present location) |
| Jul 1998 |
Shigeo Yamamoto became CEO & President (current post) |
| Oct 1999 |
Established the Mizonokuchi Sales Office in Kawasaki City, Kanagawa Prefecture (expanded business into the Kanagawa area) |
| Mar 2000 |
Established the Urawa Branch in Urawa City, Saitama Prefecture (current Minami Ward, Saitama City) (expanded business into the Saitama area) |
| Aug 2000 |
Established the Takenotsuka Sales Office in Adachi Ward, Tokyo |
| Jan 2001 |
Established the Yokohama Sales Office in Naka Ward, Yokohama City, Kanagawa Prefecture |
| May 2001 |
Established the Narimasu Sales Office in Itabashi Ward, Tokyo |
| May 2001 |
Established the Matsudo Sales Office in Matsudo City, Chiba Prefecture (expanded business into the Chiba area) |
| Jan 2002 |
Established the Omiya Sales Office in Saitama City, Saitama Prefecture (current Omiya Ward) |
| Jun 2002 |
Established the Nakano Sales Office in Nakano Ward, Tokyo |
| Jun 2002 |
Established the Chofu Sales Office in Chofu City, Tokyo |
| Jul 2002 |
Established the Fujisawa Sales Office in Fujisawa City, Kanagawa Prefecture |
| Dec 2002 |
Established the Kokubunji Sales Office in Kokubunji City, Tokyo |
| Jan 2003 |
Established the Kameari Sales Office in Katsushika Ward, Tokyo |
| Aug 2003 |
Listed on JASDAQ market |
| Sep 2003 |
Established the Ichikawa Sales Office in Ichikawa City, Chiba Prefecture |
| Sep 2003 |
Established the Tokorozawa Sales Office in Tokorozawa City, Saitama Prefecture |
| Feb 2004 |
Established the Kawaguchi Sales Office in Kawaguchi City, Saitama Prefecture |
| Jun 2004 |
Established the Nagoya Sales Office in Tenpaku Ward, Nagoya City, Aichi Prefecture (expanded business into the Chubu area) |
| Jun 2004 |
Established the Tsurumi Sales Office in Tsurumi Ward, Yokohama City, Kanagawa Prefecture |
| Nov 2004 |
Listed on the Tokyo Stock Exchange (the First Section) |
| Dec 2004 |
Established the Warabi Sales Office in Warabi City, Saitama Prefecture |
| Dec 2004 |
Established the Chiba Chuo Sales Office in Chiba City, Chiba Prefecture |
| Apr 2005 |
Established the Tama Sales Office in Kodaira City, Tokyo |
| Oct 2005 |
Established the Kashiwa Sales Office in Kashiwa City, Chiba Prefecture |
| Oct 2005 |
Established the Ikegami Sales Office in Ota Ward, Tokyo |
| Jan 2006 |
Established the Funabori Sales Office in Edogawa Ward, Tokyo |
| May 2006 |
Established the Nerima Sales Office in Nerima Ward, Tokyo |
| May 2006 |
Established the Higashiyamato Sales Office in Higashiyamato City, Tokyo |
| May 2006 |
Established the Fujimino Sales Office in Fujimino City, Saitama Prefecture |
| Jul 2006 |
Established the Hasuda Sales Office in Hasuda City, Saitama Prefecture |
| Jul 2006 |
Established the Machida Sales Office in Sagamihara City, Kanagawa Prefecture |
| Jul 2006 |
Established the Senju Sales Office in Adachi Ward, Tokyo |
| Jul 2006 |
Established the Tateishi Sales Office in Katsushika Ward, Tokyo |
| Aug 2006 |
Established the Oizumi Sales Office in Nerima Ward, Tokyo |
| Aug 2006 |
Established the Nishi-Funabashi Sales Office in Funabashi City, Chiba Prefecture |
| Feb 2007 |
Established the Obu Sales Office in Obu City, Aichi Prefecture |
| May 2007 |
Established the Sendai-Minami Sales Office in Sendai City, Miyagi prefecture (expanded business into the Tohoku area) |
| May 2007 |
Established the Kawagoe Sales Office in Kawagoe City, Saitama Prefecture |
| Jun 2007 |
Established the Iwatsuki Sales Office in Saitama City, Saitama Prefecture |
| Jun 2007 |
Established the Koshigaya Sales Office in Koshigaya City, Saitama Prefecture |
| Aug 2007 |
Established the Akishima Sales Office in Akishima City, Tokyo |
| Aug 2007 |
Established the Shimoigusa Sales Office in Suginami Ward, Tokyo |
| Aug 2007 |
Established the Kamagaya Sales Office in Kamagaya City, Chiba Prefecture |
| Aug 2007 |
Established the Haruhino Sales Office in Kawasaki City, Kanagawa Prefecture |
| Dec 2007 |
Established the Nagoya Branch in Nagoya City, Aichi Prefecture |
| Dec 2007 |
Changed the name of the Nagoya Sales Office to the Tenpaku Sales Office |
| Jun 2008 |
Established the Shiki Sales Office in NiizaCity, Saitama Prefecture |
| Jun 2008 |
Established the Tsukimino Sales Office in Yamato City, Kanagawa Prefecture |
| Aug 2008 |
Relocated the headquarters to Nishitokyo City (present location) |
| Dec 2012 |
Established the Koriyama Branch in Koriyama City, Fukushima Prefecture |
