In the first two parts of my thesis I will discuss the architectural history of the castle Weitra at Waldviertel, explaining his beginnings from a part of a medieval fortification to his function as a seat of power for various owners until his current appearance as a Renaissance castle in the possession of the Fürstenberg family collectively. The changes of the castle in its appearance and in its function throughout the ages are the key points of this chapter. In the third chapter I want do describe the uses and the inventory of the castle and of the Meierhof documented in its actual state, a functional analysis of the Renaissance complex shows the current uses and potentials, a photo documentation of the individual floors provides an overview of the castle. In the fourth and fifth chapter, the old Meierhof at the foot of the castle, which is fed by years of vacancy no longer meets today's requirements, will be rebuild in two designs for a new use. The first design provides 53 residential units according to the guidelines of housing subsidies of Lower Austria, the second contrasting design provides generous accommodation units as a freelance design, which will create 42 new residential units, the shape of the old Meierhof is restored in both designs again .