The main pergola rises 35 metres and weighs about 33 tonnes. A construction update reports that photovoltaic panels now cover most of its central section, while the edges remain uncovered. Its planned photovoltaic surface covers 2,500 square metres.
Part of the second pergola has also been assembled, according to the YouTube channel @viajareslomio. It is planned for the southern end of the project, with a diameter of 25 metres and three metal supports resting on the tunnel walls.
The design for this smaller structure includes rings fitted with water-misting clusters. Its upper section is intended to be illuminated at night, while the misting system is planned to cool visitors during the summer months.
The northern pergola has a different role: its planned photovoltaic surface covers 2,500 square metres. Both structures form part of Parque Castellana, a project that envisages putting part of the Paseo de la Castellana underground between calle Sinesio Delgado and the Nudo Norte of the M-30.
Above the buried section, the plan provides for a green area about 675 metres long and 90 metres wide, covering roughly 70,000 square metres. It is intended to connect the area around the five towers with the former San Cristóbal colony, while also linking it to a future business district planned under Madrid Nuevo Norte. The proposal also includes linked recreation and walking areas, with access on both sides of the avenue.
The landscaping plans include 787 new trees, which would bring the total to more than 1,000 when existing trees are counted. More than 38,000 shrubs are also planned. Madrid’s reported timetable sets December 2026 for the reopening of road traffic through the new tunnel and April 2027 for full completion of Parque Castellana. A separate Icomos review examined the visual effect of an intervention on Santiago’s gargoyles; the Castellana project instead sets out plans for a new public green space.
