This section of the monastery wall along Steinhöferstrasse is the only remaining structure of the former Cistercian monastery “Reynevelde” or “Purus Campus” in Latin. The monastery was founded in 1186. The monastery church was consecrated in 1236, so the stone buildings were only completed 50 years after it was founded. Previously there was a makeshift wooden structure that is said to have stood south of here on the Klosterberg. The monastery was secularized in 1582 under the Danish King Frederick II and given to the Plön Duke Johann the Elder. J. handed over. He had the buildings demolished by 1599. The demolition material was used to build the ducal castle north of the house moat. The mighty monastery church was initially left standing, but in 1635 the dam of the Herrenteich broke and the monastery church was destroyed. The monastery wall, built between the 12th and 18th centuries, originally ran from the Herrenteich along today's Hamburger Straße in the west and the Alter Garten in the south to the Herrenteich in the east. The former monastery portal is believed to be near the Karpfenplatz. The section of the brick wall that remains here is around 90 m long, 2.20 m high and 63 cm thick, built from fired bricks in the Gothic monastic style with supporting pillars inside and outside. With the construction of the Danish office building in 1775, a coach house was added, the rear wall of which consists of part of the monastery wall. In 1974, despite monument protection and without coordination with the local authorities, the Lübeck State Building Authority toppled the western section of the wall, which dates back to the 12th century, with excavators and replaced it with a modern replica.