It was used as a medicinal garden and as a secure residential compound for members of the Tokugawa extended family.

Prior to 1969, when Kitanomaru Park was opened, this district had been called Daikanchō (代官町, literal translation: Town of Local Governors) because many daikan (local governors) lived in the place soon after the construction of Edo Castle.

The Tayasu-mon was the northernmost gate of Edo Castle and consists of both a Korai-mon style outer gate and a Yagura-mon style fortified inner gatehouse, with highly stacked stone walls forming a narrow defensive courtyard between the two.

An inscription on the outer side of the Tayasu-mon states the gate was constructed in 1685, making it one of the oldest surviving structures of the original castle.

[1] Chiyoda Board of Education [ja] operates public elementary and junior high schools.