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The Façade of Time, Memory, and Publicness: Seoul City Hall Seosomun Building 1 Exterior Remodeling

ON Architectural Design Partners

written by
Park Hyunjin
photographed by
Bae Jihun
materials provided by
ON Architectural Design Partners
edited by
Park Jiyoun
background

SPACE August 2026 (No. 705) 

 

 

 

Façade module process 

 

 

Over 130 years of the site¡¯s history and five decades of architectural time, the site was the Ministry of Finance of the Korean Empire, later becoming the Supreme Prosecutors¡¯ Office (SPO), and now serves as a civic building. Rather than simply renewing the exterior, the project began by reinterpreting time, memory, and a sense of publicness through the building¡¯s façade. The diagonal geometry, derived from the diamond pattern on the existing façade, preserves traces of the past while establishing a new rhythm. Four patterns of Pocheon granite, the project¡¯s primary material, create brightness and introduce variation. On the eastern stair tower, aluminium sheets provide a material contrast to the granite façade, expressing both the building¡¯s historical legacy and its future. 

 

 

 

 

 

*You can see more information on the SPACE No. August (2026).
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Architect

ON Architectural Design Partners (Park Hyunjin)

Design team

Cho Hun, Park Sanghwa

Location

Seosomun Building 1, 37 Seosomun-dong, Jung-gu, Seoul, Korea

Programme

office

Site area

25,420.3§³

Building area

1,326.14§³

Gross floor area

21,218.45§³

Building scope

B2, 15F

Building to land ratio

5.22%

Floor area ratio

73.56%

Exterior finishing

Pocheon granite, BIPV panel

Structural engineer

Dain Your Partner Co., Ltd.

Construction

Jireh B&D Co., Ltd.

Design period

May ‒ Sep. 2020

Construction period

Mar. ‒ Dec. 2021

Client

Seoul Metropolitan Government


Park Hyunjin
Park Hyunjin holds a M.Arch from the Bartlett School of Architecture, University College London (UCL) and a Master¡¯s degree from Hanyang University, following her undergraduate studies at Dong-A University. After working at SPACE Group and SUNJIN Engineering & Architecture, she founded ON Architectural Design Partners in 2006. She has taught design as an Adjunct Professor at Korea National University of Transportation and Hongik University for 14 years, served as a Public Architect for Seoul and Gwangju, and led public architecture and urban regeneration projects as a Executive Director of the Seoul Architecture Forum. She was invited as a representative to the Biennale Internationale Design Saint-Etienne in France, and has received awards including at the Korean Remodeling Architecture Competition, the Korea Space Culture Award, the Korea Land Competition, and the Seoul Architecture Award.

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