Los Santos Elementary was an elementary school located in Los Santos featured in a pre-release trailer for Grand Theft Auto V.
Later during the game's development, the school was removed and the building instead became the University of San Andreas Training Center. The two buildings are identical except for a few changes such as the removal of the school name from the roof.
The reason that the school was cut from the game is unknown, and this is the subject of a minor myth.
In the Sue Murry election campaign trailer, the building was depicted as a large, modern elementary school. In the actual game, the building is no longer a school, but is still identical except for the removal of school logos.
Initially, its presence within the game raised speculation about children in GTA V however the removal of the school presumably also led to the removal of children. This sudden removal of children on seemingly a very late stage of development has caused many GTA V children myths.
It is possible that game developers originally planned to have this building be an elementary school, but the idea was scrapped some time during development.
One reason for the building being removed is, that it could have been removed out of respect to the Sandy Hook Elementary School shooting victims. This real-life shooting took place less than a year before the game's release.
It is also possible that game developers simply used the building as an elementary school temporarily for the Sue Murry election campaign video. Before running for Governor, Sue Murry was a teacher at a fictional school called the Los Santos Elementary.