In 1880, plans for an area where today's Henryka Sienkiewicza Avenue is situated were drawn up. It was assumed that the town green would replace water meadows that were there at that time and this would be the most representative part of the town besides Wojska Polskiego Avenue. The first buildings, richly decorated terraced houses, were put up in a north-western part of the avenue. Unlike Wojska Polskiego Avenue with its rather commercial role, Henryka Sienkiewicza Avenue was a place where the intellectual elite of Slupsk had their houses and where banks and clinics were located. Terraced houses that have remained up to this day draw visitors' attention with its rich facades and interesting constructions, e.g. terraced house no. 3 from 1890 and neighbouring house no. 2.

On the opposite side, you can admire corner building no. 18. Harmonious facades are enriched with a projection on the Henryka Sienkiewicza Avenue side and a bay window on the Zamenhoffa Street side – this is where Maritime Office is located now. Building no. 21 is an affiliate of private Stock Bank from Gdansk that was put up in 1904. This part of the avenue has its end in the corner building with an irregular construction with two tops and corner bay window with a soaring tower on its top (the upper photograph). Until the end of the Second World War, impressive flower gardens were situated in front of facades.

In the western part of the avenue, Otto Bismarck's statue stood from 1901 to 1945. After its removal, Henryk Sienkiewicz's statue was put up in 1962. Also, on the opposite side of the avenue, until the end of the war, there was Wilhelm II's statue that had been moved from Stephana Square.

Railway lines were built about 800 metres away from the town which brought about that new buildings in Slupsk could be developed only to the west. A main development axis run along Wojska Polskiego Street (called Dworcowa before) that linked a railway station that came into use in 1878 with the town centre. The first buildings appeared about 1880 in an area where the main artery crossed Adama Mickiewicza Street. Then, another streets were built in the area – they formed a grid of streets running parallel and at a 90 angle to the main street, e.g. Wilenska and Konopnickiej Streets.

Nowadays, the old town of Slupsk is believed to be situated on the western bank of the Slupia River. Still, we need to remember that until the 18th century that was a part of the town on the right bank that was called so. Even though Slupsk burnt down many times in its history, in March 1945 when the old town was set on fire by the Red Army, almost the whole area was completely destroyed. Only three terraced houses in Old Market remained, with one seriously rebuilt. One of them is historic Apteka Dworska (eng: Manorial Pharmacy) put up in 1783 on foundation coming from the first half of the 18th century. The building facade is Baroque and classical in style. Next to it, you can see a bourgeois terraced house with a characteristic peak, mansard-pediment-like roof.