 From then until 1989, the church was served by Mercedarian fathers; it is now served by Argentine diocesan clergy from a community in an adjoining house.It was built by the architect Giuseppe Astorri with a 7-storey campanile and a 2-storey façade in the style of ancient Christian architecture, with a central depiction of the Lamb and symbols of the four Evangelists.The interior is also in ancient, Roman-Byzantine style, with a nave and two aisles divided by Ionic columns, a Cosmatesque-style pulpit and lectern and a polychrome marble floor (laid in geometric patterns with the national coat of arms of Argentina in the centre, and a memorial slab to its founder, which was presented by the Argentine cardinals and bishops at the Second Vatican Council).