Koiwai House and garden is in Hongo Fujiyama Park. The house is a unique combination of a samurai house and Japanese farmhouse. It was originally located nearby but dismantled then reconstructed at its current venue in Hongo Fujiyama Park. Koiwai was a local landowner and VIP in Yokohama. In building and maintaining the park, home and garden local citizen participation is used. A unique feature of this traditional house is that it has a large samurai type gate.