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Site Context and Historical Background
Site Context and Historical Background
The project site is situated at a prominent urban node in Berlin-Mitte, the city's central administrative borough, at the corner of Otto-Braun-Straße and Mollstraße (52°31'12"N 13°25'48"E). This is within Berlin's unique Kiez urban structure, with its perimeter block developments (Häußermann et al., 2008) and mixed pre-war architectural styles with post-reunification infill development. The site's previous configuration, a 1960s state-owned Wohnungsbaukombinat Berlin Plattenbau office block, was demolished in 2018 following structural surveying that found concrete carbonation depths greater than 50mm D (DIBt, 2017), rendering it economically ineligible for retrofitting within current energy efficiency standards (GEG 2020, §48).
Regulatory Framework
Regulatory Framework
The building must comply with Berlin's stringent Bauordnung (BauO Bln, 2020), in particular:
§14 (Fire Safety): Requiring 120-minute fire resistance for load-bearing elements.
§50 (Urban Integration): Using contextual massing and facade articulation.
GEG 2020 (Energy Efficiency): Limiting primary energy demand to ≤45 kWh/m²a.
Berlin Landscape Program (LaPro, 2019): Requiring 30% permeable surfaces.
Market Analysis
Market Analysis
A current CBRE (2023) research indicates that Berlin-Mitte commands prime rents of €28/m²/month retail and €14/m²/month residential with vacancy rates below 3%. The daytime population density of the area of 12,000/km² (Statistik Berlin-Brandenburg, 2022) justifies the mixed-use program. Our demographic analysis target group (ZIA, 2022) is:
68% of residents aged 25-44 prefer walkable neighborhoods.
42% of office employees favor green-certified buildings.
81% of retailers need high foot traffic locations near transport
Design Rationale and Technical Strategy
Design Rationale and Technical Strategy
The proposed 9-storey (G+8) structure employs a reinforced concrete frame, which is economical (£1,820/m² based on BCIS 2023) and suitable for mixed use. The structural arrangement was selected on the basis of:
Span capabilities (8m clear spans for retail).
Vibration management (Δf ≤ 8Hz to provide residential comfort).
Fire resistance certification (R120).
Sustainability Innovations
Sustainability Innovations
Metal Rain-screen Cladding:
50% recycled content aluminium panels (BRE Green Guide A+ rating).
Ventilated cavity (25mm) reducing cooling loads by 38% (Fraunhofer IBP, 2021).
PVDF coating for maintenance-free 40-year performance.
Extensive Green Roof System:
1,736m² sedum blanket (FLL 2018 guidelines).
Storm-water retention of 59% (DIN 1989-1).
U-value 0.13 W/m²K (PHI certified).
Energy Strategy:
Air-source heat pumps (SCOP 3.8 as per EN 14825).
Building-integrated PV (34 kWp estimated output).
Heat recovery ventilation (≥75% efficiency)
Project Delivery Framework
Project Delivery Framework
The NEC4 Option C contract structure is justified by:
Risk allocation matrix (RICS, 2021).
Compatibility of German arbitration (DIS Rules, 2022).
Gain-share mechanism (proved 8.7% cost savings in comparable Berlin projects - TÜV Report, 2023)
Presented By: Njoku, Chiamaka
(34039680)
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