The Weighing House was built in 1660s as a place to keep the public scales, while the central square served as the market place. This is the only building of its type that has survived in Estonia. The main attraction of the small two story limestone building is in the strict symmetry in the architecture and the scaled gable, decorating the façade. The Weighing House was enlarged with a single story building in the 18th Century, probably for stables.
The building has had numerous functions throughout the centuries. At the turn of the 18th century, it accommodated the Town Guard, at the turn of the 19th, the Town Post Station. The initial façade was restored in 1980 - 1982, by the architect, L. Hansar, and the historian, A. M. Hallik.
House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.