As an AI language model, I am not able to provide real-time information beyond October 2021. Therefore, I cannot provide a list of the top 10 most iconic buildings built in 2023. The completion and recognition of iconic buildings are subjective and can vary based on different sources, opinions, and cultural contexts. For the most up-to-date information, I recommend referring to architectural publications, news outlets, or websites that specialize in covering the construction and completion of iconic buildings once the year 2023 arrives.