[1] The main building of the college was gradually and partly built on the foundation walls of the Mon Pérou Palace.

On 3 October 1856, today's lower part of the building was consecrated by Cardinal Joseph Othmar von Rauscher of the Immaculate Conception, which had just been proclaimed a Roman Catholic faith dogma.

In the following year, the school was awarded a Science Week prize and conducted the exhibition "Living Liesing" in the Volkshalle of the Vienna City Hall.

In 1999, the fourth floor was expanded for the center for crafts and artistic education, and in 2001 the new library building with a connected computer room and student buffet was opened.

Numerous events took place at the 150th anniversary of the college in 2006, including a festive exhibition with Cardinal Christoph Schönborn and a pilgrimage to the Mariazell Basilica.

From the work of the Klasnic commission which dealt with exposing sexual abuse in ecclesiastical institutions, cases in the college of Kalksburg were also investigated.

[2][3] Among other things, the former student André Heller in numerous interviews reported borderline experiences and stated abuse was "part of a terrible reality".

[6] It consists of the four-storey school and the rectory and fathers' tract, to the west in the form of an honorary court.

The collegiate chapel on the back of the rectory and father's yard shows a fresco by Bengt Olof Kälde from 1986.

The Michaels Chapel, situated on a hill, was completed in 1858/59 by the reconstruction and extension of a Diana temple built by Mack.

In the former "small garden" of Franz von Mack stands the stone house built in 1787, one of the most important secular Neo-Gothic buildings in Austria, with a remarkable interior design.