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Exterior view of the Mirador El Palmeral at the Vitoria-Gasteiz town hall in Spain

Mirador El Palmeral

Between 2020 and 2024, the historic Mirador El Palmeral at the Vitoria-Gasteiz town hall in Spain underwent extensive restoration as part of an EU-funded project. Managed by Landa-Ochandiano Arquitectos and glass restorer Vitrales Mikel Delika, the project used SCHOTT RESTOVER® plus and colored glass in Florentine and Muranese patterns, which enabled the original aesthetics to be preserved while meeting modern-day requirements.

Background

The Mirador El Palmeral is located on the north-west façade of Vitoria-Gasteiz town hall on Calle Mateo Moraza in the Basque Country, Spain. The structure extends over two floors, with each floor having nine windows, divided into three zones: hinged windows at the bottom, lattice windows in the middle, and colored stained glass windows at the top. The modernist, oriel window projects out from the façade, giving a generous view of the outside space.

The wooden structure was constructed using traditional nail-free box and tenon joints, with metal elements on moving parts such as hinges, handles, and safety bars. El Palmeral is a characteristic building from the early 20th century, with large areas of glazing that combine light, warmth, and weather protection in an aesthetically and functionally harmonious architectural structure.

Exterior view of the El Palmeral, showing the intricate, 19th century glazing

Challenge

Restoring the Mirador El Palmeral presented the project team with the challenging task of preserving the historical significance of the building while meeting modern technical and functional requirements.

Particularly demanding was the process of preserving some of the ancient windows while reconstructing others. The original material was blown glass, which contained unique irregularities that needed to be matched. An added complication was the different window shapes, sizes and patterns, which required precise design planning and documentation. Each glass element needed dismantling, numbering, and analyzing to identify damage and ensure accurate restoration.

Solution

As part of the restoration, SCHOTT RESTOVER® plus glass was chosen to preserve the historical appearance of the window front. Meeting all modern-day requirements, this glass has been specially developed for restoration projects and precisely replicates the optical properties of the historical material, including its characteristic irregularities and light refractions.

Wherever possible, damaged original panes were repaired or restored using techniques such as the Tiffany method, and when replacement was necessary, custom-fit replicas made using SCHOTT RESTOVER® plus were used. Each element could be precisely manufactured and installed true to the original thanks to detailed plans drawn up in accordance with the CVMA standard (Corpus Vitrearum Medii Aevi) and close cooperation between SCHOTT, Landa-Ochandiano Arquitectos, and glass restorer Mikel Delika.

The final result is a successful combination of historical preservation, precise craftsmanship, and modern glass technology.

    Close-up view of the lower floor of the El Palmeral viewpoint in the Vitoria-Gasteiz town hall in Spain
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    Ideal for restoration

    SCHOTT RESTOVER® plus closely resembles traditional blown glass originally manufactured at the turn of the 19th Century. Thicker than RESTOVER® and RESTOVER® light, it’s simple to install into historical window frames and fittings.
    Side view of the El Palmeral viewpoint in Vitoria-Gasteiz in Spain
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    Compliance and customization

    Meeting the latest thermal, solar, UV and noise control standards, RESTOVER® plus glass can be laminated, manufactured as insulating or fire-resistant glass, and have additional UV or IR filter films to meet different light requirements.
    Close-up view of the glazing in the El Palmeral viewpoint in Vitoria-Gasteiz
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    Traditional methods

    RESTOVER® plus glass is made by the traditional Fourcault process, which produces a ‘wavy’ effect on the glazing. The process involves molten glass being drawn through a Fourcault nozzle, creating the distinctive appearance.

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