farshid ilati, housing expert. the implementation of the horizontal development plan of cities has an effective role in reducing housing construction costs, and on the other hand , it provides the basis for accelerating the housing construction process. the horizontal development of cities , especially in tehran, can lead to a 50-6% reduction in land prices if speculative transactions are controlled, which of course is on the condition that we see an increase in land supply. ali asghar badri , managing director of the institute of city and economy studies. although the construction of existing high-rise buildings has decreased the values ​​of residence and reduced the quality of life, but the construction of high-rise buildings it is necessary in the right time and place, taking into account the macro economy and urban economy in big cities and tehran, but this. this should not happen in cities that have land and there are conditions for horizontalization. sahare nadai tosi, professor of architecture faculty of sha