
Cadaval & Solà-Morales
According to a statement, the architects explained that the project was meant to be an example of “essential architecture,” “highlighting what is indispensable and removing what is not necessary. The project seeks for a harmonic relationship between the new and the old.”

Cadaval & Solà-Morales
Source: Abandoned Mexico City building gets new life as a vibrant mixed-use space – Curbed

These incredible city-within-a-city Gasometers in Vienna were once gas storage tanks, and thanks to an incredible rehab by an all-star team of European architects, including Jean Nouvel and Coop Himmelblau, they now house over a thousand Viennese tenants in a mixed-use community rich with entertainment, office, and retail spaces.
via Vienna Upcycles Historic Coal Gasometers into Amazing Urban Communities | Inhabitat – Sustainable Design Innovation, Eco Architecture, Green Building.
Reclamation Administration: News and Research on Building Material Waste Prevention