This paper presents the principles of compiling a successful conservation policy by the Australian conservationist James Semple Kerr, summarized in his Conservation Plan. The principles are compared to recent Croatian conservation practices of Dragica Barešić and her associates on the example of the compilation of the competition program Public competition for the design of a conceptual architectural-urban solution for the new City Library at the Paromlin location in Zagreb. In the second chapter, the main principles of the Conservation Plan are presented and compared with the programs' content, in the center of which is the location of the former steam mill in Zagreb. Paromlin narrowly demonstrates the local approach to industrial archeology, more precisely, immovable heritage of significance of industrial nature. The third chapter deals with the results of the competition in the context of understanding, accepting and applying the guidelines from the conservation guidelines and to a lesser extent, all other set of conditions. The work is based on the aforementioned literature as well as the elaborations of the competitors' proposals submitted to the evaluation jury and the consequent comments of the jury enclosed as inserts of this paper.