Property Management Committee of Kostroma

The Property Management Committee of the city of Kostroma appealed to the Kostroma Regional Arbitration Court with a claim for the seizure of municipal property (building) from someone else´s illegal possession of the small enterprise Kostromaarchproekt. The controversial building was provided by the decision of the city executive committee to the Kostroma organization of the Union of Architects of the RSFSR for free to host the Kostromaarchproekt creative architectural and design workshop. According to the plaintiff, now the building is owned by a small enterprise, which is not the assignee of the workshop and therefore owns it illegally.
The defendant objected to the claim on the following grounds. The Executive Committee of the City Executive Committee at one time handed over the controversial structure as an emergency without residual value for reconstruction. For these purposes, a land plot was allocated on which the building was located. The workshop was entrusted with the development of the project and reconstruction. The work was carried out by the workshop at its own expense, the building was completely rebuilt according to a new project.
According to the decision of the Union of Architects of Kostroma, the architectural and design workshop was transformed into the small enterprise Kostromaarchproekt with the rights of a legal entity, whose charter was approved in the prescribed manner.
The defendant believes that he is the assignee of the former workshop, so the structure passed to him legally. In addition, the previous structure is no longer there, as a new object has been created. Solve the case.