After Peter Friedhofen had already opened the first convent in Trier in 1853, the Brothers of Mercy acquired a large tract of land in 1886 upon which the convent, hospital, and church were built in the next years.
Of these buildings the hospital building St. Kamillus and the Convent Church remain. In 1888 it was decided to build a new hospital and a larger church. The plans for the Convent Church were already finished by the Bonn contractor and architect J. Strecke in 1889. The church and convent were planned as one architectural unit which still today, even after many changes, can still be seen.

The Brothers of Mercy themselves enthusastically helped with the building work and on 1 September 1890 the Convent Church was solemnly consecrated by Bishop Korum.

Unfortunately, the stained glass windows were completely destroyed at the end of World War II and could not be replaced until 1948/49.

In 1972 the church was given a third renovation. Following as closely as possible the original, a fourth renovation was completed in 1985/86. By removing the altar island a homogenous worship space between chancel and nave was again attained, the statues of saints were restored to their original colors, the stations of the cross were given wooden frames in a neo-Gothic style, and the church was again ornamented with motifs drawn from nature-medicinal herbs and plants.
 

Built in the neo-Gothic style, the Convent Church of the Brothers of Mercy of Our Lady of Perpetual Help is a single nave, clearly organized design.
The exterior of the church is characterized by its use of red sandstone, the interior impresses the visitor with its light, neo-Gothic single nave with arches and five keystones crowning the vaulting. Seven windows in the choir punctuate the walls of the chancel. The altars carved of oak were conpleted 13 years after consecration, and the two side altars to Mary and Joseph are of the same type as the high altar.

When one enters the nave, one is surprised by the fullness of form, color, and the diversity of the polychromed plants lacing their way up the vaulted ceiling. Coming into the choir is entering a different world. Here the harmony and fineness of architecture are as surprising as the wonderfully ornamented vaulting, which fills the vault to the pointed arches of the choir windows.

The refurbished high altar represents a particular highpoint. The conposition of the baldachine-like towers are crowned with filias. The statue of the Sacred Heart of Jesus is above, flanked by two angels under baldachines. Left are the figures of St. Augustine, father of the Rule, and St. Alexius. On the right is the Blessed Peter Friedhofen and St. Aliosius.
 
Impressed by the fullness of form, color, and the representations on the high altar, one turns only slowly away. Perhaps the visitor lingers a while. This place is holy. Hier dwells hidden the glory of the Lord. One can believe that even on this earth there are places where heaven and earth touch. Such a place is the Convent Church.
The Blessed Peter Friedhofen must have experienced it, for in his testament for the Brothers of Mercy and for all visitors to the church, he wrote, "The chapel is in this world, dear Brothers, your paradise, even your heaven."