Lawang Ombo is a characteristic 18th Century Chinese-Javanese style house in Soditan

The Chinese-style building faces west. The front features a gate with a wooden door. The terrace has a terracotta floor, and the roof pillars are made of katu. The roof is shaped like a swallow's tail. The main room has one door and two windows. 

Jl. Sunan Bonang No. 70, Pereng Soditan, Kecamatan Lasem, Kabupaten Rembang

To the right and left of the main room are rooms facing each other. Behind the left-hand room is a 50 cm diameter corridor used for opium smuggling during the colonial era. At the rear of the main building is a two-story building with a swallow's tail roof.

Lawang Ombo is estimated to have been built in the late 18th century. Its owner was an official named Lim Cui Bun. This house serves as a relic of an opium house, as opium was once traded on the north coast of Java in the early 19th century, consumed by both commoners and aristocrats. To the west of the house is a river known as the Lasem River. It is believed that an underground passage connected the river to the opium house. This hole, located in the left wing of the house, was used for opium smuggling. At the rear is a Chinese tomb (bong) believed to be the tomb of the house's owner, Lim Cui Bun, dated 1827.

Importance: This house exhibits the characteristics of an 18th-century Chinese-Javanese house in Soditan, Lasem. It was once occupied by the first Chinese captain in Lasem in the 19th century, Liem Ki Siok. This house played a significant role in the opium trade in Lasem in the 19th century. This house represents the development of Lasem's early Chinatown and is linked to the Lasem opium trade network, which connected it to Asia through Singapore in the 19th century.