Why was a new Agora created northwest of the Acropolis in the 6th century BCE?

In the 6th century BCE, the original Agora of Athens located below the western approach to the Acropolis became inadequate to serve the city's growing needs. To accommodate this expansion, a new Agora was laid out on the low ground to the northwest.1

This development involved significant urban planning, including the demolition of existing houses and the filling in of wells and gullies to create a broad, open square. This new space was designed to serve as a central hub for the diverse activities of the citizens, including political, judicial, religious, and commercial gatherings. The area was further improved by the construction of public buildings and shrines around its borders, such as the Basileios (Royal) Stoa, the Old Bouleuterion, and a large enclosure for the Heliaia lawcourt. Additionally, the tyrant Peisistratus enhanced the site by building an aqueduct that supplied water to the Enneakrounos fountain located on the edge of the marketplace.12