Sustainable development and harmonization of the architectural environment of cities Nadiia Shebek, Viktor Timokhin, Yuliia Tretiak, Ievgenii Kolmakov and Oleksandr Olkhovets E3S Web Conf., 166 (2020) 09001 Published online: 22 April 2020 DOI: 10.1051/e3sconf/202016609001