• The project covers the refurbishment of a Haussmann-style building at 35 Rue Marbeuf in the 8th arrondissement of Paris for use as offices (Level -1 to level 6) and retail (basement and ground floor).
• The building was constructed in 1885 on 7 floors and a basement. It surrounds an inner courtyard entered from the Rue Marbeuf via a former carriage entrance with porch.
• The 6 upper floors of this mixed-use building are categorised as a workspace within the meaning of the French Employment Code, while the ground floor (83m²) and basement (40m² closed to the public) are rated as Category 5 Type M public spaces (ERP).
  
  

The building is designed to be occupied either by a single tenant (Employment Code + Public Space rated areas) or one tenant per level, with the exception of Levels 5 and 6, which are available only as a single unit.

To avoid compromising office and meeting room volumes, all utility services and technical systems are concentrated in the suspended ceiling spaces of areas such as corridors, toilets and technical spaces. The ceiling heights of the heritage building have been retained in the main business areas. These are between 2.95 and 3.50 metres on the upper floors, reducing to 2.50 metres on Level 6 (formerly an attic containing servants’ quarters).

• The existing structural floors and roof structure have been retained and restored.
• A waterproofing treatment will be applied to the external walls of the business spaces in the basement.
• The upper floors have been successfully tested for an operating load bearing capacity of 350 daN/m².

• Office spaces: There are no suspended ceiling in the office spaces.
• Corridors and service spaces: Plasterboard suspended ceilings with 80 mm of acoustic insulation. Fabric covering (specified to M2 fire rating). Maintenance access will be provided via concealed hatches.

•  The ground floor shop fronts facing the street are clad in anthracite steel sheet, with matching anthracite double-glazed metal-framed windows. The architectural treatment of the ground floor door frames is designed to visually harmonise the whole of the ground floor.
• Both the ashlar facade facing the street and the rendered facade facing the courtyard have been restored to their original appearance. The exterior joinery on the upper floors has been replaced with anthracite timber and double-glazed windows.
• The rooflights are modified to match the lower floor openings.
• The bow window facades have been replaced with a curved section for a more contemporary look.
  
  

• The courtyard has been enhanced using cobblestones sourced from the Paris region and will be PRM accessible.
• A bed in the centre of the courtyard will be planted with 6 trees, which will be watered using recovered rainwater.

• Since the total floor area of the office spaces is less than 300 m², there will be no smoke extraction system.
• Since there is no single space of 100 m² in the basement, there will be no smoke extraction system.
• Staircase smoke extraction will be via opening vents located on either the external walls or roof.
  
  

•  All existing electrical installations and equipment will be removed and refurbished.
• The project specification is for a 36 kVA regulated tariff (tarif bleu) meter in the retail space, and a 240 kVA regulated tariff (tarif jaune) meter in the main LV distribution board space in the basement of the office building. A distribution cabinet connected to the consumer unit is installed in the porch for the two new inlets.
• There will be one control cabinet per level, from the ground floor to Level 6.
  
  

• LED lighting and UGR <19 are specified for offices and meeting rooms.
• Bulb colour temperatures will be 3,000K neutral white on the upper floors, and 4,000K for the retail space.
• The linear lighting units in office and meeting spaces are dimmable, giving an average illuminance level of 300 lux at workstations.
• Lighting in all interior spaces (except AHU technical spaces) is controlled by presence detection or presence + level detection. It will also be possible to force on/off switching of these lighting circuits in office, bar/lounge and meeting spaces.
• Outdoor and porch lighting is controlled by light level detection and a timer that can be configured via the BMS.
  
  

•  Heating will be generated from a substation fed by the CPCU urban heating network, and delivered by fan coil units, radiators and AHU coil units. Chilled water will be produced by a substation fed by the FRAÎCHEUR DE PARIS urban cooling network, and will be delivered by fan coil units and AHU coil units. Heating and cooling is delivered by 4-pipe fan coil units installed in suspended ceiling spaces, below windows, ducted or otherwise and concealed as part of the joinery works.
• Building ventilation is provided by a dual-flow air handling unit.
  
  

• The two existing water inlets in the oval culvert on the Rue Marbeuf side of the basement will be replaced to serve the offices and retail spaces.
• Pressure booster pumps will be installed for the cold water supply. A cold water feed manifold installed downstream of the booster pumps will distribute cold water to the offices, general services, the sprinkler system and the softened process water system.
• Domestic hot water will be produced by independent electrically-heated hot water tanks or on-demand electric water heaters.
• The automatic watering system planned for the landscaped spaces of the courtyard is fed from a rainwater collection system installed beneath the courtyard.
  
  

• Lift 01 - 800 kg at 1m/s serving the Levels -1 to Level 6
• Lift 02 - 800 kg at 1m/s serving the Ground Floor to Level 6

• A Category B FSS with a Type 2A alarm system is planned for the office levels.
• A secure refuge space is provided on all levels from Level 1 to Level 6.
• To improve fire safety, the open floor areas have been divided into 2 zones of less than 300 m², each served by the main staircase and the existing service staircase.
• Given its direction of opening, the former carriage entrance to the porch from the Rue Marbeuf will remain open when the building is occupied.

• The main entrances to the building and the main technical spaces are fitted with access control systems.
• Protective measures have been put in place to control access to offices where different tenants occupy different levels of the building.
• Lift cars have badge readers installed, and no external preselection of destination level.
• An anti-intrusion system with detectors will be installed in street-facing spaces and the ground floor porch.
  
  

• The building will have a low-voltage power supply for general services, the BMS and security systems.
• Cabling will be provided from the connection point to operator spaces, the VDI-SGX room and the hardware concerned.
  There are no plans to install VDI pre-cabling for the office floors.
• A WiFi network is installed in the communal areas of the building (ground floor and courtyard).