 First buildings by Pomerantsev were built in Rostov-on-Don; the block-sized "Moskovskaya" Hotel (1885, now City Hall) and Gench Building (1883) were at that time the largest structures in the city.These building followed the European eclectic tradition.In 1889 Pomerantsev won an open competition to design the Moscow Upper Trading Rows (now GUM) on Red Square, his first large, and perhaps his most conspicuous project.