

Boulogne-Billancourt holds 136 office lots in 15 buildings — about nine lots per address, the profile of multi-tenant floors rather than single-occupier headquarters. The listed addresses follow the commune's main axes: 117 avenue Victor Hugo and 126 avenue du Général Leclerc through the centre, 15/17 rue de Vanves and 7 rue Le Bouvier to the south, 77/83 avenue Edouard Vaillant and 21 quai Alphonse le Gallo down towards the Seine.
Median lot size in Boulogne-Billancourt is 47 m², against a floor of 5 m² and a ceiling of 520 m². Half of the 136 lots being under 50 m² makes Boulogne-Billancourt a market for small teams and for satellite offices kept close to Paris; anything running towards that 520 m² ceiling has to be tested address by address, because only the upper part of the size range reaches it.
Rents in Boulogne-Billancourt run from €270 to €665 per m² a year with a median of €345, and that median sits far below the mid-point of the range — most of the stock is priced in the lower half, while €665 marks the exception rather than the norm. Budgeting a 47 m² unit in Boulogne-Billancourt at the median gives roughly €16,200 a year, a figure worth carrying into negotiations on any lot quoted near the top band.