Advanced Starship Design Bureau
From Star Trek: Theurgy Wiki
The Advanced Starship Design Bureau (ASDB) was a body of Starfleet that designed starships and also conducted research, design reviews and systems simulations. In the late 24th century ASDB's integration facilities were located at Utopia Planitia Fleet Yards, Antares Fleet Yards, McKinley Station and Starbase 134. Source: Memory Beta]
Nator 159 served in the Advanced Starship Design Bureau at Utopia Planitia Fleet Yards from 2367 until 2380.