Talk politics.

From the perspective of urban planning, it's a social and architectural horror to remove a historical part of the city and replace with a mega business district, no matter how much the project is valued. After a couple of decades half the offices are empty because these buildings were built as an "investment" in the first place, and not based on verifiable local needs. The sidewalks around "skyscrapers" tend to become barren, dirty and devoid of any social activities. I bet there are more than plenty shopping malls in Belgrade already. It would be much wiser if the city knew how to manage and create value locally rather than looking for large foreign investment influxes.