The objective of the research was the problem of optimal priorities of the buildings' renovation or major repairs. The number of works can be great because of their short duration. This fact increases the computational processing time depending on linear increase of projects' number exponentially. Uncertainty of the projects' characteristics increases with the time as well. For solving this problem the definition of serial importance of project was introduced and the dynamics of this serial importance was reviewed. The model of the space-time analogy based on the category of the aerial perspective and horizon was built. On the basis of application of this analogy the algorithm of the optimization of priorities in buildings' reconstruction or major repairs was suggested