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554.5 metres tall, Lotte World Tower is a mixed-use skyscraper in Seoul, South Korea. It ranks number 6 among the world's tallest completed buildings by architectural height. [2]
| Architectural height | 554.5 m1,819 ft |
| Height to tip | 555.7 m1,823 ft |
| Highest occupied floor | Not confirmed |
| Observation deck | Not confirmed |
| Floors above ground | 123 |
| Floors below ground | 6 |
| Completed | 2017 |
The architectural height is 554.5 m in Wikidata and the Skyscraper Center; Wikipedia commonly rounds to 555 m. Its 555.7 m tip is a distinct measure. The completion field uses the 2017 opening milestone. See source ↗
Design, structure and construction.
Technical sources reviewed 9 September 2026.
Long-span floors carried between eight concrete mega-columns.
Concrete core walls and eight mega-columns form the primary system, linked by outriggers and belt trusses. The office and officetel levels use long-span spandrels up to 24.5 metres between columns. At corners, these members cantilever approximately 14 metres while following the curved floor edge.
Read the technical source ↗Those long corner cantilevers made floor deflection and vibration important serviceability checks. Belt trusses manage changes in column layout between uses: hotel columns transfer toward the mega-column arrangement below, and the upper diagrid lantern connects through another structural transition.
Read the technical source ↗Lotte E&C reports a foundation mat 72 metres square and 6.5 metres thick. That massive concrete base supports a mixed concrete-and-steel superstructure. Construction then had to coordinate core and mega-column work with the long-span floor framing and the transfer zones between the tower’s different uses.
Read the technical source ↗The taper helps reduce wind loading, but creates changing geometry and structural spans over the tower height. LERA studied several perimeter arrangements before the owner selected long-span spandrels for the lower occupied zones. The choice traded simpler intermediate supports for more open floor plans.
Read the technical source ↗Design architects, engineers and construction firms have different responsibilities. Credits identify the published role on this project.
Explore architects & builders ↗Height bars use the same scale. They do not represent building shape. Measurement source ↗
Record updated 2026-09-24. Sources can differ on height categories, floor counts and completion milestones. Read our methodology.
Directory record updated . Most recent recorded field check: . Updating the page does not re-verify every fact.
| Checked | Field | Evidence and decision |
|---|---|---|
| height architectural m | Compared the retrieved sources and retained the explicit height category. | |
| status | Compared the retrieved sources and retained the explicit height category. | |
| completed | Occupancy-completion year distinguished from structural work. |
These notes predate this visible log. Their original change dates are not reconstructed.
Earlier record edits may not have a complete audit trail. Read the methodology and correction policy ↗
Lotte World Tower reaches 554.5 metres (1,819 feet) by architectural height, with a tip height of 555.7 metres.
It was completed in 2017.
Lotte World Tower stands in Seoul, South Korea.
It has 123 above-ground floors and 6 below ground.