Schönleiten Castle

In 1888, the Sacred Heart Fathers Peter Barral (a Frenchman) and Johannes Ilge (a Rhinelander) acquired the estate as the first house of the missionary order of the "Congregation of the Missionaries of the Most Sacred Heart of Jesus" and converted it into a monastery. On May 20, 1888, the first mass was celebrated in the house chapel; this day is therefore considered the founding day of the mission house in Liefering. In 1895, a monastery church in Renaissance style was built and equipped with an organ in 1909. In 1904, the school building was constructed, and in 1914, the boarding school was opened as a junior school for the order, with another building (Lyceum) added in 1929. The fathers were long referred to as "Heilmayerherrn" and the students as "Heilmayerbuam".

In 1938, the National Socialists closed the school. Part of the buildings were reinforced with concrete walls and ceilings, the building was given camouflage paint, and remnants of the old castle wall were demolished to make way for a coach house and a stable. A barracks camp for refugees from Ukraine was built on part of the site and other plots of land; Ukrainians were also housed in the school building. Due to a naming error by the Americans, this camp continued to be used for refugees after the war under the name "Lager Lexenfeld".

From 1946, the grammar school, which received public status in 1956, was reopened, and the school building was reoccupied in 1950. The barracks of "Lager Lexenfeld" were demolished, and the space has since served as a sports field. The air-raid shelter ceilings in the school building were removed. In 1955/56, a boarding school building was erected on the site of the coach house and stable. In 1995/96, the old canon's small castle was converted into a mother house for all Missionaries of the Sacred Heart, including those returning from missions due to old age. The school's entrance gate was moved from Schönleitenstraße towards the garden front in 1972.

In 1972/73, another boarding school building was erected, misjudging future developments; boarding school operations have since been discontinued due to lack of demand. Already in the 1960s, the condition that all students would eventually become Missionaries of the Sacred Heart was dropped. The principle of self-sufficiency from the monastery's own agriculture was also abandoned due to a lack of monastery members, and the workshops run by the monastery brothers were given up. Instead, accommodation and guest rooms were built for MC sisters. The monastery houses "Bondeko" (an acronym from the Lingála language for "covenant, brotherhood, friendship"), an Austria-wide liaison office with the Third World.

The original monastery church from 1895 was demolished in 1967 in favor of a modern and very dark concrete church building by the Salzburg architect Ingeborg Kromp-Schmidt, which was consecrated by Archbishop Andreas Rohracher on April 1, 1967, after six months of construction.