The house St. Martin utilizes parts of the grounds that once belonged to the large estate of the von Erlanger family. Here were the outbuildings, for whose construction a continuous row of houses was laid down at that time. The so-called Monika Chapel in the back area was established in 1950 by the "Monika Sisters" within the walls of the former coach house.
The "Monika Sisters" operated an old age home and other charitable institutions here until 1975.
Baron Wilhelm von Erlanger, a lawyer from a well-known Frankfurt banking family, purchased a property with buildings shortly before his wedding in 1859, which once belonged to the Palatine Colonel and General Quartermaster Anton Otto von Cloß. He bequeathed the core part of his estate to the Jesuit order. After the secularization, the property changed hands multiple times.
Wilhelm von Erlanger moved in with his wife Caroline, née von Bernus into the simple country house already present on the grounds and gradually expanded it into a magnificent manorial residence in the style of the Neorenaissance: the "Villa Carolina". The estate was expanded through further acquisitions, and part of it was transformed into a landscape garden with a pond, pheasantry, and botanical treasures with the involvement of the renowned garden architect Heinrich Siesmayer. The wealthy couple engaged personally in community life and financially supported various projects. The passionate hunter Wilhelm von Erlanger was also the one who advanced and completed the final purchase of the Ingelheimer Forest from the municipality of Daxweiler. For his excursions with guests to the Rhine, he had the Rheinklause, today "Anglerklause," built. The couple had two sons, of whom the younger, Carlo von Erlanger, made a name for himself as an ornithologist and African researcher. After his early accidental death in 1904, Caroline von Erlanger handed over his valuable collection to Nieder-Ingelheim.
In 1938, on the site of the "Villa Carolina," the so-called Jägerhof, a three-wing residential building in neo-baroque formswas constructed according to the plans of architect Paul Darius for the chemical manufacturer Albert Boehringer and his wife Marianne.
