Monterosa91, Palace in Milan, Italy

Monterosa91 stands at viale Monte Rosa 91 in Milan's Fiera district, on the east side of a former industrial block. Renzo Piano's project gave the complex a horseshoe plan: one side of the original square perimeter was demolished, leaving a central hill topped by a garden that conceals an underground car park. The glass facade is fitted with green shutters, and the building rises seven levels, two of them below ground.

The site was occupied first by Isotta Fraschini and then by Siemens-Italtel, which in 1958 had Carlo Rusconi-Clerici build a large industrial complex with Sogene, featuring a shed hall and longitudinal blocks linked by tunnels and conveyors. After dismission in the 1990s, Il Sole 24 Ore commissioned Renzo Piano to build a new headquarters on the eastern part. Between 2020 and late 2022 a change of ownership brought heavy restoration, a new name and a new use.

The block's name comes from viale Monte Rosa 91, where it stands in the Fiera district; for decades it housed the editorial offices of the newspaper Il Sole 24 Ore, which commissioned Renzo Piano's project after the industrial buildings were abandoned in the 1990s. The green shutters on the glass facade are the element a passer-by notices first.

The complex stands on viale Monte Rosa 91 in the Fiera district, on the site of the former Isotta Fraschini and Siemens-Italtel works. The eastern part of the old industrial block was kept and reworked by Renzo Piano, while one side facing the street was demolished to open a horseshoe courtyard. The central garden mound conceals an underground car park.

The 1958 Siemens-Italtel complex, built by Carlo Rusconi-Clerici with Sogene, had longitudinal blocks joined by purpose-built tunnels and conveyor belts. Renzo Piano's later project kept four heavily modified industrial buildings on the east side of the block, and one side of the original square perimeter was demolished to open the horseshoe courtyard.