The aim of the project is the comprehensive refurbishment, in an occupied environment, of the communal areas of a block of flats built at the end of the 19th / beginning of the 20th century. The general condition of the commun areas is average to dilapidated. The only service room proposed is the 3.6m² garbage shed in the largest courtyard. We propose deconstructing the existing garbage shed and building a new one at the back of the courtyard. For our first research hypothesis, we propose installing the lift shaft in the bathrooms of stack D (located next to the staircase). In terms of the issues at stake, the structural problem is paramount. It’s a very interesting project, with a certain complexity and architectural potential to be taken up.