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Overpass Forest 多樂 다락옥수

Development Type: Redevelopment/Regeneration Project

Type Of Developer: Public Private Partnership

Start Year: 2016

Address: 411-2, Oksu-dong, Seongdong-gu, Seoul, Republic of Korea (Local Post Code : 133-842)


Contributor: audex


Location Description
Located in front of the 7th exit of Oksu station, a central Area of Oksu Kumho Oullim Apartment and Low-level residential Area. Neighbors a Buddhist temple and an elementary school, okjeong elementary school.

Case Report


The 1st Pilot Project of the Feasibility Study and Comprehensive Plan for Overpass Space Utilization Project, this project is about renovating left over spaces within the city for the future public intervention. To cope with topics such as segregation from the streetscape, disconnection from the local community and security vulnerability, this project provides a vegetation slope in the Eastern part, corresponding to the towers and the city, an architectural box that accommodates a multi-functional book lounge, and flexible indoor programs in the West side, responding to the commercial district, and a public square with theater seats in the North,  via inviting nearby contexts, creating a more pleasant area than ever before.

Development Info.

Development Scale: Region

Total Development Cost: 1,000,000,000 KRW

Total Land Area: 1901.2m² (*Total Area 30*60*11 m)

Total Development Area: 646.18m²

Area Type: Urban Area - Urban Residential Area

Start Date: 2016/04/01

Opening Date: 2018/04/03

Planning Approval: 2017.06. The 1st Pilot Project of the Feasibility Study and Comprehensive Plan for Overpass Space Utilization Project

Lead Developer: Jo Jinman Architects

Consultants: "Seoul City Space Improvement Team, ASK architects, Landscape Architecture 울, Seoul Spatial Information Officer"


Economic Context

Many street stalls located in site, Originally surrounded by few small commercial facilities.(1 Cafe)

Social Context

Site originally used as a road to school for elementary school students. Placed in-between residential area. Regional flea markets, bazaar and small culture festivals held in the existing open space.

Environmental Context

Limited Sunlight, Noize and vibration by the traffic of the overpass. Limited natural green elements. Requires space for overpass maintenance. 11meters of height, creates ambiguity between In and out of the space.

Historical Context


The Plan

Pre-planning Efforts

Domestic and foreign usage cases under-overpass area Usage cases of idle spaces. Culture and art space management and operation cases

Vision Statement

Under-Overpass Area 2017 : Regeneration through coexistence [Source : Study for under-space of overpass in Seoul , 2017, Seoul]

Goals and Objectives

Recovery of severance, Multipurpose space, Expandability, Mixed Use Development( City in a City), Local public connection, Diversity and immediate constructability Exotic city structures, Integrated space, shared space, local assets [Source : Study for under-space of overpass in Seoul , 2017, Seoul]

Issues and Problems

Idle space that is not being utilized properly, only 10% of existing under-overpass areas are being used as a meaningful space. The necessity of comprehensive review on the utilization plan of the overpass and railroad overpass which are scheduled to be demolished is emerging. Noize and vibration from the overpass, limited sunlight, Lack of play and stay area for residents nearby.

Benchmark Projects

Lowline, New york, U.S. One central park, Sydney, Australia Canary Wharf Tube station, London, U.K.

Public Engagement Strategy

Informing locals every process of the project, Multiple resident-invited debates and talks regarding the project, which influenced selecting the programs.

Financing Strategy


Existing Community and Residents

The project provides the residents with a space possible to play in, and also a space for supervision of parents. The programs were derived by collecting opinions from various related ministries, experts, and residents. The opinions require mainly 5 program categories, which are 1. Maintain existing programs, 2. Education programs for youth and children 3. Community-oriented programs 4. Culture/art programs 5. Public space creation

Phasing Strategy

Overall planning, integration of ideas of the project and Architectural design process were carried out at the same time, followed by immediate construction, which shortened the project.

The Master Plan

A Low-sloped hill filled with natural green elements facing East, acting as a roof for a glass-box formed area which is the multi-functional lounge facing South. Stand-type rest shelter located in a square space located in the North, and 4meter high roof structure made of 5000 mirror-like panels, reflecting the sloped hill for pedestrians. The interior includes a sun-portal, absorbing sunlight and creating an indoor garden.

Land Uses and Programs

Room; kids cafe/small library (kids library, kids play area) Multi-functional book lounge(Kids education, resident lectures) yard(Flea market, bazaar market, culture festicvals)

Timeline or Milestones

ʼ16. 04. Started feasibility study and comprehensive plan establishment for the use of elevated sub-spaces ʼ16. 06. Seongdong-gu overpass space pilot project utilization plan received ʼ17. 03~06. Basic and Detailed Design of the Overpass Space of Oksu Station ʼ17. 05. Completion of feasibility study and comprehensive plan establishment for the use of elevated sub-spaces ʼ17. 07~8. Establishment of the operation plan for the use of the elevated sub-space at Oksu Station was completed ʼ17. 07. 18~12. Oksu Station Overpass Construction Work ʼ17. 12. Completed the construction of the underpass space at Oksu Station '18. 04. 03 Open to public

Current Status

6 pilot projects of the Feasibility Study and Comprehensive Plan for Overpass Space Utilization Project Construction completed

Lessons Learned

What is the most important take away from this case?

Acting as a standard for future low-use urban area renovation projects, giving information and references of success and failure points.

Why is this case relevant today and for whom?

Low-use urban area renovation projects are taking a big part of policies and urban projects related to cities. Experimental programs such as the sun-portal system can be a benchmark for future applications in other projects. This is relevant to people involved in future urban renovation projects.

Which strategy was proved to be successful?

Integrating local communities and residents to the planning process brought out clear enough programs which lead to guaranteed usage. These projects are mainly based on a competition, which makes planning and design process go together, making the overall project duration shorter. Using existing programs, and strengthening the identity of the open space creates via indoor spaces and attractive roof elements lead to increase of commercial facilities, which eventually helps local economy and security.

In your opinion, what could have improved this project?

The project was attractive enough for existing local users, but not for inviting more people. Providing information and advertising of such a project to the citizens would drive out more ideas regarding low-use urban areas, and provoke attention to these areas, forming a more compact urban context.

Any other comments?

An attractive project for such a low cost, and it was worth the investment in terms of acting as a standard for future projects.


OFFLINE Resources and References

"Analysis of factors affecting the activation of the idle space under the underpass by cohort(코호트별 고가하부 유휴공간의 활성화에 미치는 요인 분석), 2019 Feasibility Study and Comprehensive Plan for Overpass Space Utilization Project(고가하부공간 활용사업 타당성 조사 및 종합계획), 2017.03 Budget report for the use of elevated sub-spaces(고가하부공간 활용사업 예산 보고서),2018 시민의 품으로 돌아온 고가하부 Return of the lost space exhibition, Seoul hall of Urbanism&Architecture 다락옥수, 다리 밑에서 놀자, Leaflet on site"


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Contributor audex


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