Here the Lubavitcher Rebbe or elder Chassidim would address Chassidim and other visitors about Torah observance and Chassidic philosophy and practice. As the Lubavitch movement grew in the United States, the original synagogue became too small to house the chasidim and students who came to pray and study there. The synagogue was expanded in several stages. The first annex was added in 1960, with subsequent expansions taking place in the late 1960s and again in the mid-1970s. The synagogue then reached its current size. The original synagogue remains as a small study hall used by rabbinical students during the week. In 1988, Rabbi Schneersohn laid the cornerstone for an ongoing renovation project. The original building is part of a larger block maintained by the Agudas Chasidei Chabad. This block includes the larger synagogue, a Kollel (Kollel Tiferes Zekeinim), and the community's library. It also houses the offices of the secretariat of the Lubavitch Movement and other offices. 770 is an iconic site considered holy by members of the Chabad movement. It attracts thousands of visitors from around the world every year. The building is recognized as an Orthodox Jewish synagogue, which is open to all people, with a men's section on the ground floor and a women's section on the floor above it. On Shabbat and holidays, smaller prayer groups can be found congregating throughout the building, including the lobby and office used by the Rebbe within the original 770 building. The synagogue's official name is "Congregation Lubavitch of Agudas Chasidei Chabad". A dispute over the legal ownership of 770 Eastern Parkway resulted in a court decision giving ownership to Merkos L'Inyonei Chinuch and Agudas Chasidei Chabad. Building Main Synagogue The building contains a stairway that leads to the main synagogue. The synagogue is underground, and is considered part of 770, although it technically is mostly under 784 and 788. Central Lubavitcher Yeshiva The building contains a Yeshiva with approximately 1000 students. The Yeshiva is a part of a group of Yeshivot called Tomchei Tmimim, started by the 5th Chabad Rebbe Sholom Dovber Schneersohn of Lubavitch. Replicas Lubavitch Chassidim attach great significance to everything that played a role in the Rebbe's life; therefore, Lubavitch Chassidim all over the world have built replicas or near-replicas of the building. These include replicas in Ramat Shlomo in Jerusalem and Kfar Chabad in Israel. UCLA Chabad House at UCLA Los Angeles, California; Chabad House