OC Máj – A Renovation That Respects History and Looks Toward the Future

The renovation of the iconic OC Máj shopping center in the very heart of Prague was a challenge in every respect. The construction work, which began in July 2022 under the leadership of general contractor Metrostav in collaboration with Baustav, transformed the 1970s building—a designated historic landmark—into a modern multifunctional space that preserves its historical value.

The first phase involved the complete removal of the lightweight cladding and the professional removal of structures containing asbestos. After removing all non-load-bearing elements, including utility lines and equipment, only the original load-bearing structure and concrete cladding remained. The prestressed TT panels—a unique feature of the original construction by a Swedish contractor from 1972–75—were also exposed.

Since the building was designated a cultural monument in 2006, the entire project was carried out in close collaboration with historic preservationists. In addition, the developer recognized the site’s potential and enhanced the building with new features—such as a viewing platform above the original machinery and a restaurant with an outdoor terrace on the top floor, offering an exceptional view of the city.

The project was technically challenging not only because of the work involved in the historic interior, but also for logistical reasons— the lack of space for a construction site and limited access to supplies in the city center required precise planning and management of every step.

One of the most striking and widely watched features was the installation of the artwork *Butterflies* by David Černý. Its structure, made of composite materials, was created in collaboration with an aerospace engineer—its structural integrity meets the same standards as those for aircraft. The first wing underwent a load test just like an aircraft prototype. Due to their size, transportation had to be planned precisely; literally every centimeter mattered when passing under bridge structures.

Safety on the facade is ensured by a unique water mist fire suppression system, which protects the surrounding area in the event of a fire without endangering pedestrians. The assembly of the butterflies was rehearsed at the manufacturing plant, and their installation required the closure of Národní and Spálená streets as well as the suspension of tram service. The entire operation was carried out successfully and with precision to one attempt over the weekend of May 18–19, 2024 .

The OC Máj project is proof that respect for history can go hand in hand with a modern approach, technical innovation, and original artistic expression.