## 5 Conclusions  
In this research, a model is presented so that the role of the tall buildings' visual impacts in the city can be properly considered in decision-making for the location of tall buildings in the city. The central hypothesis of this research was that a set of criteria is vital in locating tall buildings.  
The main question of this research was how to find a solution that is reproducible and can be used in any other city based on many heterogeneous criteria. To do this, the criteria were divided into two-dimensional criteria and three-dimensional criteria. In two-dimensional criteria, technical issues affecting the location of tall buildings were identified and weighted and prioritized based on the opinion of experts by the ANP method in Super Decisions V2.8 software. In the three-dimensional section, the fuzzy visual analysis was applied by MATLAB software considering how much of a tall building can be seen from urban spaces. In this way, this research provided a model that was able to examine a large number of heterogeneous variables affecting the location of tall buildings and to determine their weight and priority.  
After evaluating the criteria, locations should be chosen that not only do not negatively impact the city, but also positively impact it. The final filter for locating tall buildings is a visual criterion that is very important in the city. In other words, in addition to evaluating technical criteria, the visual impact and its positive influence should be considered. Due to the complexity of three-dimensional analysis, the proposed model in this research is formed in two stages: the first stage is reviewing technical criteria to narrow the possible urban area for locating tall buildings, and the second stage is reviewing visual criteria in which only areas of the city that have been identified as suitable for the construction of tall buildings in terms of two dimensions are examined in the first stage.  
In this study, the main limitation is the unavailability of 3D images of the city with sufficient accuracy. This limitation might change the research results. We tried to get as close as possible to the existing reality through field research. However, observing correct height codes for both the land and the building requires more accurate mapping data.  
This research generally seeks to find the appropriate framework for locating tall buildings. This research's framework presented in two main steps. In the first step, technically suitable locations of the city for constructing tall buildings were recognized. In the second step, parts of the city that had both a positive visual impact on the city and positive technical criteria were identified. The method and framework used in this research can be used in all cities around the world. In fact, in each city, the criteria and sub-criteria and their weights can be reviewed based on the city's priority.  
This model can be considered individually for areas considered more desirable, and offers a proper location in each zone.  
The designed program can evaluate a building's visibility in future development plans if the input data is accurate enough. In this program, one of the essential requirements for preparing a precise output is the accuracy and precision of the information. In further studies, vegetation and distance impact can also be considered and can be focused on providing a set of regulations.  
Conceptualization, M.K.; methodology, M.K.; software, H.H., S.S., M.S. and F.A.; validation, M.K. and H.H.; formal analysis, H.H. and F.A.; investigation, M.K.; resources, S.K.; data curation, F.A.; writing--Original draft preparation, M.K. and H.H.; writing--Review and editing, M.K. and S.K.; visualization, S.S.; supervision, M.K.; funding acquisition, S.S. All authors have read and agreed to the published version of the manuscript.  
We acknowledge the support of the German Research Foundation (DFG) and the Bauhaus-Universitat Weimar within the Open-Access Publishing Programme.  
The authors declare no conflict of interest.