Impact Story – Rooftop Republic Creating a Green Sky City and Nurturing an High-end Farming Lifestyle to Urbanites

Hong Kong’s skyline is dominated by towering skyscrapers, fragmenting the city’s sky. Andrew Tsui, who shuttles through the narrow streets, often contemplates how urbanites can live comfortably in a highly commercialized environment while cultivating an appreciation for food and the environment. In this prosperous city, fresh fruits and vegetables are readily available, thanks to the abundance of supply, resulting in few people contemplating and experiencing the process of nurturing food. That said, building a resilient and sustainable city requires a fundamental understanding of the “food source” as an essential part of the life cycle. Recognizing this need, “Rooftop Republic” (“RR”) was established. Andrew, with his unique perspective from his background and work experience, envisioned creating a liveable city. In 2015, he co-founded RR with two partners, aiming to reconnect urbanites with food in an era of food surplus and waste.


Amidst the ubiquity of phubbers in Hong Kong, one can discover the hidden gem of the green sky city cultivated by RR if they simply lift their heads in this bustling metropolis. Andrew and his team are ready to guide those willing to embrace the “high-end” farming lifestyle.


Rooftop Republic’s Success Hinges on a Close Trilateral Relationship

While dining at a penthouse may be easily accessible, venturing into rooftop farming poses its challenges. Andrew describes the partnership of building a rooftop farm as “a trilateral relationship.” Through this triangular collaboration, the RR team collaborates with building developers, tenants, and property management companies to create a green sky. RR currently serves a diverse range of clients, including commercial buildings such as offices, malls, restaurants, hotels, and private housing estates, with commercial buildings comprising the majority. “By partnering with these three stakeholder groups, we could successfully secure idle urban spaces and develop rooftop farms. Additionally, we hope to engage a broader audience, such as building employees and their families and friends. Each party plays a role in maintaining this long-term, stable triangle relationship, which grants us the flexibility to meet varying needs,” shared Andrew.


Top left: Farming on a decommissioned helipad at the JLL managed urban farm at Central

Top right: Harvest Event at Fortune City One

Bottom left: LINK Lok Fu Place Urban Farm

Bottom right: Metroplaza Rooftop Organic Farm is the city’s largest public access urban farm located in a shopping mall


Nurturing a Grounded Culture by Bringing “High-Flying Stories” to the Community

Social participation and community culture cultivation are integral to RR’s long-term goals. They aim to convey the concept of urban farming and its behind-the-scenes stories to a broader audience. In collaboration with DBS Bank and Swire Properties in 2021, RR, also a DBS Foundation Social Enterprise Award grantee, established a rooftop farm at One Island East in Taikoo Place. This farm, situated at an elevation of almost 300 meters, stands as the tallest urban farm in Asia and is one of the five urban farms as part of The Loop – Swire Properties’ sustainable development initiative. In addition to 50 planter boxes for growing vegetables and herbs, the rooftop also features food waste processors, converting the building occupants’ food waste into compost for the farm.


The organizers of the rooftop farm encourage building employees to visit during their leisure time to discover the joy of farming and connect with nature in the city’s heart. Despite our diverse industries and social roles, we all share the identity of “global citizens.” RR utilizes the rooftop as a hub to transform urban life and cultivate sustainable living practices. They host planting workshops and guided tours intermittently during holidays, attracting more people to engage in farming beyond the confines of conventional urban life. They then bring those experiences and stories into various communities. During the interview, Andrew and several “urban farmers” provided detailed descriptions of each plant, leaving a lasting impression of verdant vegetation on the minds of the urban residents. Corn, taro, chili, mint, and laksa leaves, among other herbs, have found their sense of belonging in the urban environment.

Left: Andrew Tsui (leftmost), Kitty Ng, Assistant Project Manager (second from right)  and Rooftop Republic farmers Fiona and Chun Yin

Right: Urban farm tour at The Loop One Island East


Enhancing High-Altitude Safety and Improving Farming Efficiency through Technology and Expertise

Chun Yin has worked as an “urban farmer” at RR for over a year. With his extensive experience in conventional farming, he transitioned to aerial farming. He jokingly said, “Urban farming differs greatly from traditional farming regarding the farming environment, mode, and processes. The primary focus is on utilizing technology to reduce physical exertion. Nonetheless, the passion is not diminished for people like me who love planting, and we may even derive greater pleasure. Urban farming allows us to reach more people, and through my work, I can teach others interested in agriculture based on my previous experience and relevant courses I’ve finished, which is highly satisfying for me.”


Developing farming at heights comparable to the Eiffel Tower raises safety concerns. Andrew utilized his civil engineering expertise to conduct preliminary assessments during site inspections. He then consulted professionals to evaluate the building’s load-bearing capacity, wind speed, and urban planting conditions, including sunlight, waterproofing, and drainage, to create an optimal and safe farming environment. “Our farm design has been tested for different levels of typhoon weather in Hong Kong, and the management techniques we have learned are also applicable to other urban areas and future adverse weather conditions,” explained Andrew. Although not large in scale, this farm has all the necessary facilities. RR farmers visit the rooftop every week to manage the farm, observe plant growth and implement an automatic irrigation system, regulating water usage and irrigation time for the following week, thus reducing water consumption and efficiently allocating manpower resources.


Expanding Perspectives on Development through Peer Competition and Striving for a Sustainable Path Together

The market features numerous comparable enterprises, and in the face of market competition, Andrew stated: “When RR was established, the market had not yet exhibited a trend of competition. Through forward-thinking approaches, we explored the essence of urban life while expressing our ideas to society. Perhaps owing to our innovative development model, RR has maintained remarkable growth since its establishment. Despite the emergence of competitors with similar visions, we believe that competition is necessary for gaining a more objective and comprehensive understanding of the entire market and exploring different development perspectives.” The Hong Kong market still holds unlimited potential, with many idle building rooftops as potential development targets. Before expanding into other markets, RR commits to scaling up within Hong Kong, further cultivating its unique urban farming culture and community, and applying the successful experiences gained to other cities in the future.


As companies continue to pursue their environmental, social, and governance (ESG) targets, urban farming has become an easily accessible and meaningful approach for listed companies, real estate development projects, and green buildings. RR assists these companies in reducing carbon emissions and promoting stakeholder engagement and well-being through urban planting, accelerating their progress towards sustainable development. As a social enterprise, RR has garnered wide recognition for its green image, and its collaborations with commercial companies aim to achieve established quantitative indicators while stimulating changes in people’s attitudes and behaviour.


The primary objective of impact investment is to address social issues. Social Impact Partners (SIP) invests in enterprises with significant potential for social impact across various industries in Hong Kong and becomes a promoter of sustainable urban development. RR’s green vision expands the scope of urban life by encouraging city residents to contemplate the origin of food while exploring creative approaches to sustainability. Lillian Li, CEO of SIP, commented on this investment project: “As a city with an extremely high population and building density, Hong Kong’s limited space presents opportunities for rooftop farming. RR has explored the operational direction and innovative business models for eight years, maintaining stable development even during the pandemic’s restricted social interactions. We look forward to continuing our collaboration with RR to promote green and sustainable development in Hong Kong and establish a self-sufficient urban living.”