<|im_start|>system
You are a helpful AI assistant.<|im_end|>
<|im_start|>user
Which is the tallest building in the world? Where is it located?<|im_end|>
<|im_start|>assistant
The tallest building in the world as of 2023 is the Burj Khalifa, located in Dubai, United Arab Emirates. It stands at a height of 828 meters (2,716 feet) with 163 floors.

Some key points about the Burj Khalifa include:

It took six years to construct and was officially opened in January 2010.
The building was designed by the Chicago-based architectural firm Skidmore, Owings and Merrill (SOM).
It is part of a development called Downtown Dubai, which includes the Dubai Mall and the Dubai Fountain.
The building's design was inspired by the hymenocallis flower, a regional desert flower that has long petals extending from its center.
It has an observation deck called "At the Top" located on the 124th floor, which offers panoramic views of Dubai.
The Burj Khalifa has a Y-shaped floor plan that is intended to maximize views of the Arabian Gulf.
The building features a mix of uses, including office space, residential apartments, and a hotel. The hotel occupies floors 1 to 39, with the residences and office space occupying the remaining floors.
The tower held several world records upon its completion, including tallest building, tallest free-standing structure, highest number of stories, and highest occupied floor.<|im_end|>
<|im_start|>user
Are any other taller buildings going up and have some of those been completed?<|im_end|>
<|im_start|>assistant
Yes, there are several supertall skyscrapers under construction that aim to surpass the Burj Khalifa's height:

- Jeddah Tower in Saudi Arabia, projected to reach 1 kilometer (3,281 feet) tall with over 200 floors. Construction started in 2013 but has faced delays. If completed, it would be the tallest building in the world.
- Sky Mile Tower in Tokyo, Japan is projected to be 1 mile (1.609 km) tall with 80,000 residential units. However, construction has not started yet and the project faces many technical and financial challenges.
- China Zun Tower in Beijing, China is projected to reach 528 meters (1,732 feet) with 109 floors. Construction started in 2013 and was completed in 2018, making it the second tallest in Beijing.

Some other very tall towers have also recently been completed, including Shanghai Tower, Makkah Royal Clock Tower Hotel, and Guangzhou CTF Finance Centre. The race to build ever taller skyscrapers continues in the Middle East and Asia. However, many wonder if there is an ultimate limit given challenges around cost, safety, engineering constraints, and more.<|im_end|>